Defendant strenuously urges there was insufficient evidence to carry the case to the jury on the issues of premeditation and deliberation and the trial court erred in not allowing *559his motion for a nonsuit on the first degree murder charge. Taking the evidence in the light most favorable to the State, we find sufficient evidence to permit a jury to find premeditation and deliberation. These elements of first degree murder are not usually susceptible to direct proof, but must be established, if at all, from the circumstances surrounding the homicide. State v. Buchanan, 287 N.C. 408, 215 S.E. 2d 80 (1975) ; State v. Sanders, 276 N.C. 598, 174 S.E. 2d 487 (1970), rev’d on other grounds, 403 U.S. 948, 29 L.Ed. 2d 860, 91 S.Ct. 2290 (1971) ; State v. Faust, 254 N.C. 101, 118 S.E. 2d 769 (1961), cert. den., 368 U.S. 851, 7 L.Ed. 2d 49, 82 S.Ct. 85 (1961). Previously existing hostile feelings between defendant and deceased, State v. Moore, 275 N.C. 198, 166 S.E. 2d 652 (1969) ; a prior assault upon the deceased by defendant, State v. Gales, 240 N.C. 319, 82 S.E. 2d 80 (1954) ; the use of grossly excessive force, State v. Buchanan, supra; and killing in an unusually brutal way, State v. Watson, 222 N.C. 672, 24 S.E. 2d 540 (1943), have all been held to be circumstances tending to show premeditation and deliberation. There was evidence here of these circumstances and, in addition, evidence of revenge as a probable motive.
Murder in the first degree is the unlawful killing of a human being with malice, premeditation and deliberation. State v. Moore, supra; State v. Faust, supra. If defendant resolved in his mind a fixed purpose to kill his daughter and thereafter, because of that previously formed intent and not because of any legal provocation on her part, deliberately and intentionally killed her with a meat cleaver, a deadly weapon, the three essential elements of murder in the first degree — premeditation, deliberation, and malice — occurred. “Malice is not only hatred, ill-will, or spite, as it is ordinarily understood — to be sure that is malice — but it also means that condition of mind which prompts a person to take the life of another intentionally without just cause, excuse, or justification.” State v. Benson, 183 N.C. 795, 799, 111 S.E. 869, 871 (1922). Malice exists as a matter of law “whenever there has been an unlawful and intentional homicide without excuse or mitigating circumstance.” State v. Baldwin, 152 N.C. 822, 829, 68 S.E. 148, 151 (1910).
The record here contains plenary evidence from which the jury could find that defendant, motivated by ill will and express malice toward his daughter because of her prosecution of him in district court, intentionally killed her. All of the following evidence — that he gave her fifteen minutes to leave the house, that *560he went into the kitchen and got the meat cleaver, and that at the expiration of fifteen minutes struck her numerous blows so that her head was “partially off. There was a very deep laceration about her neck . . . others under her chin and about her face” — tended to show premeditation and deliberation as well as malice. Hence, defendant’s motions for nonsuit were properly overruled.
Defendant next contends it was error to admit into evidence his 17 June confession. Pertinent evidence on this question was as follows:
Sergeant Parker first attempted to question defendant at the Forsyth County Jail on 15 June 1978. He advised defendant fully of his rights as required by Miranda v. Arizona, 384 U.S. 486, 16 L.Ed. 2d 694, 86 S.Ct. 1602 (1966). Before the jury, Sergeant Parker testified that defendant “indicated” that he understood his rights. Parker said:
“ . . . After we advised him,- he wanted to call his attorney, Mr. Braddy. He talked with someone on the phone and told us he would tell us what we wanted to know, but not then. The next time we attempted to question him was on the seventeenth at the county jail, then at the detective office.”
Sergeant Parker and Sergeant Brown at the jail on 17 June 1973 again asked defendant if he wanted to talk. Parker testified:
“He said he wanted to talk to us, so we took him across the street. We again advised him of his Constitutional Rights on June 17,1973.”
In response to a question as to whether in his opinion defendant then understood his rights, Sergeant Parker testified over objection:
“In my opinion, he understood them. He indicated that he did. We did not threaten him. We simply asked him if he wanted to tell us what happened, and he said he did. He said he wanted to call his daughter. He used the phone.”
At this point the jury was excused and a voir dire hearing conducted to determine the admissibility of the confession. During this hearing Sergeant Parker again testified that in his opinion defendant understood his rights. With regard to the statement itself, Sergeant Parker said:
*561“ . . . We wrote it down, read it back to him, had him read it, and he signed it. He made two corrections; one on page two adding ‘in my room’ and on page three adding ‘my,’ my house, then he signed it. Sergeant Brown and myself witnessed his signature on each page. When he corrected it, I read it to him — he read it himself. There were no promises made or threats made while we took the statement by anyone.”
Sergeant Parker, on cross-examination, admitted that on 17 June defendant “refused to sign the waiver of rights after we had advised him of his rights. ... He said he did not want a lawyer, but wanted to call his daughter. He then made a voluntary statement, and didn’t ask us to stop at any time.” When asked whether defendant refused to sign the. waiver because he didn’t understand it, Sergeant Parker said he would not deny this but that he did not remember exactly defendant’s reason for refusing. He testified that they read and reread the written waiver to defendant and “when we asked him did he understand it, he said, ‘Yes.’ We asked him to sign it, and he refused.”
Sergeant G. D. Brown also testified on voir dire that on 17 June 1973 Sergeant Parker advised defendant of all of his rights as required by Miranda, fully detailing them. When asked on direct examination whether in his opinion defendant understood his rights, Sergeant Brown testified:
“I believe he understood. He didn’t want an attorney, but he wanted to call his daughter. He said he understood the rights. I was present while Sergeant Parker did the interrogating and wrote it down. After it was completed,Sergeant Parker read the statement back to Mr. Patterson, then Mr. Patterson read it and made a couple of corrections. Then he signed it. We witnessed his signature. There were no threats or promises made at any time.
* # *
“The interrogation lasted about an hour. It does not contain everything that Mr. Patterson said, just the general basis of it.”
During cross-examination the court asked Sergeant Brown, “Did he say he wanted to go ahead and make a statement?” Brown replied, “Yes, sir, he did. He made the phone call and after he did, he sat back down and said he was ready to talk to us.”
*562Defendant’s evidence on voir dire was to this effect: Jim Moore, a deputy clerk of court, testified that he was present at defendant’s preliminary hearing on 26 July 1973, and that Mr. George Braddy appeared then on behalf of the defendant as his attorney and presented an order to send defendant for a mental examination. Mr. Reginald Moore, official court reporter in Forsyth County, testified that he reported defendant’s trial before Judge Armstrong in January 1974. His official record of the trial proceeding indicated that Sergeant D. B. Parker had testified as follows:
“Q. Mr. Patterson didn’t sign a waiver of rights, did he?
"A. No, sir. He refused to sign one.
“Q. Isn’t the reason he refused to sign it because you refused to give him the attorney he wanted?
“A. No, sir. He said he just wouldn’t sign anything.
“Q. He wouldn’t sign anything?
“A. Not unless he knew what it was.”
Mr. Curtis Todd, an attorney practicing in Winston-Salem, testified that he had represented defendant in the past and that he talked with defendant “shortly after the alleged occurrence by telephone from City Hall or the jail. He wanted me to come down there and talk to him but I told him I could not.”
Defendant testified essentially that after being “questioned” about his constitutional rights he did not make a statement because he wanted an attorney present. He asked for lawyer George W. Braddy “but Sergeant Parker said he didn’t know him, so I asked for another lawyer.” Sergeant Parker wouldn’t let him call another one because Parker wanted him to sign the rights waiver. Two or three days later, the officers took him across the street where he then refused to sign the waiver because he didn’t have a lawyer present, stating, “I wanted Attorney Braddy present before I signed anything.” Braddy had represented him in his assault trial on 14 June and visited him at the jail on 18 June for the purpose of collecting a balance due on Braddy’s fee. On Sunday morning, 17 June, Sergeant Parker asked him if he wanted any other lawyer and he replied that he would like to call Curtis Todd who had handled a civil matter for him earlier and whose number he knew. *563Sergeant Parker called and talked with Todd, and then allowed defendant to talk with Todd. Defendant testified, “They forced a statement out of me,” and that he, in fact, did not sign the statement.
Curtis Todd, being recalled, testified defendant called him twice and one time could have been on a Sunday when defendant was in custody. Todd said, “I know he was in custody because the officer did get me and put him on the phone.”
Defendant offered the visitor’s log of the Forsyth County Jail which showed that Mr. George W. Braddy, an attorney practicing at 608 O’Hanlon Building, Winston-Salem, visited defendant at 3:15 p.m. on 17 June 1973 and at 10:30 a.m. on 29 June 1973.
It was stipulated that the signed confession was obtained at 11:30 a.m. on 17 June 1973.
Upon this evidence Judge McConnell found, in pertinent part:
(1) On 15 June, when first questioned by Sergeant Parker, defendant asked to call his lawyer, Mr. Braddy, used the telephone, and then stated “he would talk to them later, but did not wish to make any statement at the time.”
(2) On 17 June, after being duly advised of his rights pursuant to. Mircmda, defendant “stated that he did not want an attorney, but would like to talk to his daughter and that he was given the phone and talked to someone . . . and . . . thereafter, he . . . freely and voluntarily made a statement which has been identified by Officers Parker and Brown.”
(3) On 17 June, “the defendant said he did not want to sign a waiver of his rights, but did make a statement freely and voluntarily after being advised of his rights and after stating that he did not want an attorney present.”
(4) “That the defendant. . . appears to be intelligent, above average intelligence . . . and that he was coherent and appeared to understand what he was saying and, after the statement was written down ... it was read to him and he himself appeared to read it and made certain corrections. ...”
Upon these findings, Judge McConnell concluded:
“ . . . [T]he statement made by the defendant . . , was made voluntarily, knowingly, and independently and that *564the defendant was in full understanding of his Constitutional Rights to remain silent and the rights to counsel and all other rights and, in fact, stated that he did not want a lawyer . . . that he purposely, freely, knowingly, and voluntarily waived each of the rights which had been read to him on several occasions by the two officers and thereupon made a statement to the officers which shall be introduced into evidence over the objection of the defendant.”
Judge McConnell’s findings are amply supported by competent evidence. His conclusions and determination of admissibility are, likewise, supported by his findings. His ruling, consequently, that the confession is admissible will not be disturbed on appeal notwithstanding that there may be evidence from which a different conclusion could be reached. State v. Simmons, 286 N.C. 681, 213 S.E. 2d 280 (1975) ; State v. McRae, 276 N.C. 308, 172 S.E. 2d 37 (1970) ; State v. Gray, 268 N.C. 69, 150 S.E. 2d 1 (1966), cert. den., 386 U.S. 911, 17 L.Ed. 2d 784, 87 S.Ct. 860 (1967).
Nevertheless, defendant contends, with regard to the confession: first, his refusal to sign a written waiver precluded a finding of waiver; second, it was error to permit the investigating officers to testify as to their “opinion” of defendant’s understanding of his rights; third, at least that portion of the confession relating to the district court proceedings resulting in an eighteen months’ sentence being imposed upon defendant was inadmissible inasmuch as it tended to show the commission of another criminal act; and fourth, defendant was in fact represented by counsel at the time his confession was taken which, itself, precluded its admissibility.
To support his first contention defendant relies strongly on United States v. Nielsen, 392 F. 2d 849 (7th Cir. 1968). In this case the defendant was warned of his rights before questioning by an FBI agent. He read a statement of his rights contained in a waiver form and said, “I am not going to sign this document. I have an attorney . . . and I am not signing anything, including this form, until I have occasion to talk to [the attorney] .” The defendant told the agent, however, that questioning could continue. Holding that defendant’s negative responses to certain questions then asked him by the agent were not admissible, the Seventh Circuit said:
“Here the defendant’s refusal to sign the waiver form, followed by an apparent willingness to allow further ques*565tioning, should have alerted the agents that he was assuming seemingly contradictory positions with respect to his submission to interrogation. Instead of accepting the defendant’s equivocal invitation, the agents should have inquired further of him before continuing the questioning to determine whether his apparent change of position was the product of intelligence and understanding or of ignorance and confusion.” Id. at 858.
Thus, defendant argues that his refusal to sign the waiver form makes his confession the product of “ignorance and confusion,” inadmissible under the rationale of Nielsen.
[2, 3] Refusal to sign a written waiver is a fact which may tend to show that no waiver occurred. It is not conclusive in the face of other evidence tending to show waiver. There is no constitutional requirement that the waiver be in writing. “An express statement that the individual is willing to make a statement and does not want an attorney followed closely by a statement could constitute a waiver.” Miranda v. Arizona, supra, at 475. Our statute expressly permits oral waiver. G.S. 7A-457 (c). Sergeant Parker testified that defendant said on 15 June that “he would tell us what we wanted to know, but not then.” On 17 June, Sergeant Parker testified that defendant replied affirmatively when asked “if he wanted to tell us what happened,” and stated then that “[h]e didn’t want an attorney, but he wanted to call his daughter.” Sergeant Brown testified that after defendant used the telephone on 17 June “he sat back down and said he was ready to talk to us.” This is sufficient to constitute an oral waiver.
 A refusal to sign a waiver form does not necessarily preclude a valid oral waiver. State v. Simmons, supra; State v. Wright, 274 N.C. 84, 161 S.E. 2d 581 (1968) ; United States v. Johnson, 455 F. 2d 311 (5th Cir. 1972) ; United States v. Hopkins, 483 F. 2d 1041 (5th Cir. 1970), cert. den., 401 U.S. 1013, 28 L.Ed. 2d 550, 91 S.Ct. 1252 (1971) ; United States v. Crisp, 435 F. 2d 354 (7th Cir. 1970), cert. den., 402 U.S. 947, 29 L.Ed. 2d 116, 91 S.Ct. 1640 (1971) ; United States v. Thompson, 417 F. 2d 196 (4th Cir. 1969), cert. den., 396 U.S. 1047, 24 L.Ed. 2d 692, 90 S.Ct. 699 (1970) ; Hodge v. United States, 392 F. 2d 552 (5th Cir. 1968). In Thompson, the Court of Appeals for the Fourth Circuit said:
“. . . In view of Thompson’s intelligence, his affirmative statement that he understood the explanation of his *566rights, and the voluntariness of his confession, we hold that his refusal to sign a written waiver did not render the confession inadmissible. [Citations omitted.] ” Id. at 197.
In short, Judge McConnell has found defendant’s confession voluntary and his waiver of constitutional rights the product of intelligence and understanding. These findings, supported by competent evidence, are, as we have said, conclusive on appeal.
 It was, we believe, error to permit interrogating officers Parker and Brown to testify “in their opinion” defendant understood his rights. Whether defendant understood is a question of fact which is capable of being proved and therefore must be proved if at all by his actual responses, verbal or otherwise, to the explanations given him of his rights. The officers are no better qualified to assess the understanding, or lack thereof, of a defendant than is the trier of fact; Therefore, the general rule prohibiting “opinion” testimony applies. “ pinion is inadmissible whenever the witness can relate the facts so that the jury [or trier of fact] will have an adequate understanding of them and ... is as well qualified as the witness to draw inferences and conclusions from the facts.” 1 Stansbury’s N. C. Evidence § 124 (Brandis Rev. 1973), and cases cited at n.16. While lay opinion of the mental capacity of another is admissible in many instances, id. § 127, “[generally ... a witness may not give his opinion of another person’s intention on a particular occasion.” Id. § 129, and cases cited at n.15. Similarly, we hold that a witness may not give an opinion as to whether a defendant in a criminal case understood his rights but must instead detail the facts upon which the opinion rests.
 There was, nevertheless, other competent evidence of defendant’s understanding. The most telling is that defendant attempted to exercise his right to counsel on 15 June and, according to his evidence, again on 17 June. He also exercised his right to remain silent on 15 June. Also, Sergeant Brown testified that on 17 June defendant “said he understood the rights.” (Emphasis added.) The question of defendant’s understanding was for the trial court. We must presume the court based its finding on the competent evidence and ignored that which was incompetent. Where the court is the trier of facts, “in the absence of words or conduct indicating otherwise, the presumption is that the judge disregarded incompetent evidence.” City of Statesville v. Bowles, 278 N.C. 497, 502, 180 S.E. 2d 111, 114-15 (1971). “[T]he court’s findings of fact will not be reversed *567unless based only on incompetent evidence.” Cogdill v. Highway Comm., and Westfeldt v. Highway Comm., 279 N.C. 313, 320, 182 S.E. 2d 373, 377 (1971). Beyond a reasonable doubt this error was not prejudicial to defendant.
Defendant further contends that error occurred when the trial court admitted that portion of his confession which states:
“He left court about 10:30 Thursday morning. The judge had sentenced him to eighteen months for protecting his house against Mae Ruth. He had attorney Braddy appeal the case. . .
Defendant’s exception to this portion of the confession is not properly supported by a specific objection. “[W]here only a portion of a witness’ testimony is incompetent, the party moving to strike should specify the objectionable part and move to strike it alone.” State v. Pope, 287 N.C. 505, 511, 215 S.E. 2d 139, 144 (1975). See also 1 Stansbury’s N. C. Evidence § 27 (Brandis Rev. 1973).
 Since this is a capital case, we will, nevertheless, consider the contention. State v. Fowler, 270 N.C. 468, 155 S.E. 2d 83 (1967) ; State v. McCoy, 236 N.C. 121, 71 S.E. 2d 921 (1952). Later in the confession, defendant states that “[h]e was so confused about the lies she told in court that he went in her grandmother’s bedroom,” where shortly the killing took place. This was evidence from which a jury could find that in defendant’s mind he had been sentenced to eighteen months on account of lies told in court by the deceased. “Where evidence tends to prove a motive on the part of the accused to commit the crime charged, it is admissible, even though it discloses the commission of another offense by the accused.” State v. McClain, 240 N.C. 171, 176, 81 S.E. 2d 364, 367 (1954), citing State v. Birchfield, 235 N.C. 410, 70 S.E. 2d 5 (1952). In Birchfield, evidence was held to be properly admitted that the victim of the assault being tried had, on a recent occasion, prosecuted the defendant for an earlier assault because “[t]his evidence had a logical tendency to show intent and motive on the part of the defendants.” Id. at 415, 70 S.E. 2d at 8. There was no error in admitting this portion of the confession.
Defendant next contends that the trial court erred in admitting his confession since it was taken at a time when he was represented by counsel, Mr. Braddy, whose presence he had not waived. Although again the record is not entirely clear, Mr. *568Braddy apparently represented defendant on 14 June in district court on the assault charge. On 15 June, defendant requested a chance to call Mr. Braddy. The police officers knew that defendant talked to someone but did not know whether it was Mr. Braddy or whether Mr. Braddy had agreed to represent defendant. According to defendant himself, testifying on voir dire: he did not call Mr. Braddy from the county jail but after his confession was made, Mr. Braddy came to see him in jail for the purpose of collecting a balance due on his fee for his representation on the assault charge. There was testimony that Mr. Braddy appeared for the defendant on 26 July 1973 to secure an order to have the defendant sent for a mental examination. Because of the time and nature of this appearance it would have little significance in determining whether Mr. Braddy represented the defendant on 17 June 1973.
 Assuming that Mr. Braddy’s representation of the defendant on the assault charge continued through 17 June, there was no denial of defendant’s right to counsel in the murder case. A defendant may waive the presence of an attorney in a case under investigation when the attorney represents him on an unrelated charge. United States v. Crook, 502 F. 2d 1378 (3rd Cir. 1974), cert. den., 419 U.S. 1123, 42 L.Ed. 2d 823, 95 S.Ct. 808 (1975) ; United States v. Dority, 487 F. 2d 846 (6th Cir. 1973). See also People v. Taylor, 27 N.Y. 2d 327, 266 N.E. 2d 630, 318 N.Y.S. 2d 1 (1971), which held that the New York rule that an accused, after indictment and arraignment, may not be questioned by police on those charges in the absence of counsel, applied only when the police or prosecutor knew that an attorney had been secured to assist the accused “in defending against the specific charges for which he is,field.”
Defendant relies on United States v. Hedgeman, 368 F. Supp. 585 (N.D. Ill. 1973). In that case, however, the officers misled the defendant into thinking that making a statement would help him and they also had actual knowledge that defendant was represented by counsel in the very case under investigation. There is no suggestion of clever misleading in this case, and as we have said, nothing in the record would support a finding that defendant was actually represented on the charges under investigation.
Judge McConnell has found upon competent evidence that defendant intelligently waived his right to counsel. Such a finding was not precluded even if defendant was represented *569by counsel on a charge unrelated to that under investigation. There is no showing of a denial of defendant’s right to counsel under these circumstances.
Defendant next argues that his constitutional rights were violated by the denial of his petition filed pursuant to G.S. 7A-454 for an order approving a fee to employ the services of a psychiatrist of his own choice to assist him in preparing for trial. It is not clear from the record whether in fact his motion was allowed by Judge Armstrong’s order of 20 November 1973. It does not affirmatively appear who selected Dr. Proctor. Assuming the trial court and not defendant chose Dr. Proctor, defendant’s constitutional rights were not thereby infringed. We are not called upon to address the question of whether an indigent defendant is constitutionally entitled, on a proper showing, to have the State provide him psychiatric assistance in the preparation of his defense. Defendant had that. G.S. 7A-454 provides only that “[t]he court in its discretion, may approve a fee for the service of an expert witness who testifies for an indigent person. . . .” The statute permits but does not compel providing an expert to a criminally accused at State expense.
 The question presented then is whether an indigent who has been criminally accused and who has already been provided with two psychiatric experts at State expense, whose findings do not suggest that defendant is or has been legally insane or that he is incompetent to stand trial, and whose competency and standing in their profession have not been challenged, is entitled by reason of constitutional due process or equal protection to have the State furnish him still another psychiatrist selected by him. We have found no case that stretches the constitutional mandates this far and defendant has cited none. A number of decisions uphold the denial of an indigent defendant’s request for an additional psychiatric expert of his own selection at state expense when the state has already provided competent psychiatric assistance from either state-designated physicians, Utsler v. Erickson, 315 F. Supp. 480 (D.S.D. 1970), aff'd, 440 F. 2d 140 (8th Cir. 1971), cert. den., 404 U.S. 956, 30 L.Ed. 2d 272, 92 S.Ct. 319 (1971) ; McGcurty v. O’Brien, 188 F. 2d 151 (1st Cir. 1951), cert. den., 341 U.S. 928, 95 L.Ed. 1359, 71 S.Ct. 794 (1951) ; Taylor v. State, 229 Ga. 536, 192 S.E. 2d 249 (1972) ; Utsler v. State, 84 S.D. 360, 171 N.W. 2d 739 (1969) ; Commonwealth v. Belenski, 276 *570Mass. 35, 176 N.E. 501 (1981) ; or physicians practicing privately and selected by the trial court, Barber v. State, 248 Ark. 64, 450 S.W. 2d 291 (1970) ; Commonwealth v. Medeiros, 354 Mass. 193, 236 N.E. 2d 642 (1968), cert. den., 393 U.S. 1058, 21 L.Ed. 2d 699, 89 S.Ct. 699 (1969) ; State v. Greenwood, 197 Kan. 676, 421 P. 2d 24 (1966) ; People v. Richardson, 192 Cal. App. 2d 166, 13 Cal. Rptr. 321 (1961). Concerning an indigent’s entitlement to expert assistance generally, see “Right of Indigent Defendant in Criminal Case to Aid of State by Appointment of Investigator or Expert.” Annot., 34 A.L.R. 3d 1256 (1970).
We do not think defendant has been denied due process.
Neither has defendant here, under the circumstances, been denied equal protection of the law. We held in State v. Frazier, 280 N.C. 181, 185 S.E. 2d 652 (1972), death sentence vacated, 409 U.S. 1004, 34 L.Ed. 2d 295, 93 S.Ct. 453 (1972), that an indigent defendant while entitled to competent counsel at State expense was “not entitled to have the court appoint counsel of his own choosing.” Id. at 198, 185 S.E. 2d at 663. If Frazier is sound constitutionally, and we believe it is, then a fortiori, an indigent defendant on a proper showing of reasonable need is entitled by reason of constitutional equal protection to no more than having the State furnish competent psychiatric assistance.
Defendant, having been psychiatrically examined by a medical expert specializing in psychiatry at Cherry Hospital and by a privately practicing psychiatrist who we assume was selected by the trial court, has been assured an adequate opportunity to present his claims fairly. He has not been denied due process or equal protection by failure of the trial court to provide him without charge an additional psychiatrist of his own choosing. See Ross v. Moffitt, 417 U.S. 600, 41 L.Ed. 2d 341, 94 S.Ct. 2437 (1974).
 Defendant’s next contention is that the court erred in allowing into evidence two photographs of deceased inasmuch as defendant stipulated the cause of death. This contention is without merit. The actual photographs were not made part of defendant’s case on appeal. He argues, simply, that where the cause of death is stipulated in a homicide case, photographs of deceased are inadmissible since their only purpose would be to inflame and prejudice the jury. This argument misses the point that in a first degree murder case premeditation and de*571liberation may be proved circumstantially by showing the use of grossly excessive force, State v. Buchanan, supra, or by proof of the brutal manner of killing, State v. Watson, supra. A mere stipulation as to the cause of death may not necessarily convey to the jury full information as to the actual manner of killing. In such a case it is legitimate and often necessary to use testimony describing in detail the manner of killing, and photographs, properly authenticated, may be offered to illustrate this testimony. Defendant relies on State v. Foust, 258 N.C. 453, 128 S.E. 2d 889 (1963). The basis for decision there was that “ten gory photographs in color” of the deceased were introduced and each one explained in detail. This seemed to us to be “an excessive use” of photographs in a case where the defense was that an accident occurred when the defendant and deceased began playing with a gun. Foust represents an exception to the general rule that photographs of a victim in a criminal case, when properly authenticated, may be offered to illustrate relevant testimony of witnesses even though the scenes portrayed are unpleasant or even gruesome to behold. State v. Boyd, 287 N.C. 181, 141, 214 S.E. 2d 14, 20 (1975) ; State v. Duncan, 282 N.C. 412, 418, 193 S.E. 2d 65, 69 (1972) ; State v. Atkinson, 275 N.C. 288, 311, 167 S.E. 2d 241, 255 (1969), death sentence vacated, 403 U.S. 948, 29 L.Ed. 2d 859, 91 S.Ct. 2283 (1971). The two photographs in question were properly authenticated by Officer Hicks who testified that they accurately depicted the deceased as he observed her when he arrived at the scene of the killing. They were properly admitted into evidence to illustrate the testimony of the witness.
 By his next assignment of error, defendant contends that the trial court erred in refusing to strike the testimony of State’s witness Viola Súber, offered for the purpose of corroborating the testimony of Mrs. Lillian Patterson, when, in fact, Mrs. Suber’s testimony did not corroborate that of Mrs. Patterson.
“The admissibility of prior consistent statements of the witness to strengthen his credibility has been challenged by counsel and reaffirmed by the Court in scores of cases. Such evidence is admitted not only to rebut the implications arising from testimony as to prior inconsistent statements, but also where the witness’s veracity has been impugned in any way.” 1 Stansbury’s N. C. Evidence § 51, pp. 146-47 (Brandis Rev. 1973), and cases cited therein. See Section 52, id., and cases *572therein cited for criticism of the North Carolina rule and the reasons for it. In Lorbacher v. Talley, 256 N.C. 258, 123 S.E. 2d 477 (1962), Justice Bobbitt, later C.J., quoted with approval:
“As stated by Smith, C.J., in Jones v. Jones, 80 N.C. 246, 250: ‘In whatever way the credit of the witness may be impaired, it may be restored or strengthened by this [proof of prior consistent statements] or any other proper evidence tending to insure confidence in his veracity and in the truthfulness of his testimony.’ Bowman v. Blankenship, 165 N.C. 519, 81 S.E. 2d 746; Brown v. Loftis, 226 N.C. 762, 764, 40 S.E. 2d 421; Stansbury, of. cit. § 50. . . .”
See Gibson v. Whitton, 239 N.C. 11, 79 S.E. 2d 196 (1953). Such previously consistent statements, however, are admissible only when they are in fact consistent with the witness’s testimony. State v. Bagley, 229 N.C. 723, 51 S.E. 2d 298 (1949) ; State v. Melvin, 194 N.C. 394, 139 S.E. 762 (1927) ; 1 Stansbury’s N. C. Evidence § 52, pp. 150-51 (Brandis Rev. 1973).
If the previous statements offered in corroboration are generally consistent with the witness’s testimony, slight variations between them will not render the statements inadmissible. Such variations affect only the credibility of the evidence which is always for the jury. State v. Bryant, 282 N.C. 92, 191 S.E. 2d 745 (1972) ; State v. Norris, 264 N.C. 470, 141 S.E. 2d 869 (1965) ; State v. Case, 253 N.C. 130, 116 S.E. 2d 429 (1960).
,. r Applying these principles to the evidence in this case, we hold that it was not prejudicial error for the trial judge to refuse to strike Mrs. Suber’s testimony offered to corroborate the testimony of Mrs. Patterson. Mrs. Suber’s testimony, in the context of all the evidence, was not inconsistent with and not contradictory to the testimony of Mrs. Patterson. At most thére was a slight variance which, when considered with all the evidence, could not possibly have prejudiced defendant. Mrs. Patterson testified, in summary, as follows: She, the deceased, and defendant were in her and defendant’s residence on the morning of the killing when defendant and deceased began arguing. This argument was apparently a continuation of some previously existing controversy between deceased and defendant, which ended when deceased successfully prosecuted defendant that very morning in Forsyth District Court for an earlier assault upon her. While Mrs. Patterson was equivocal when asked if anyone else was in the house, she stated, “I *573couldn’t tell who was in there because I couldn’t swear because I didn’t look under the bed.” However, she never identified anyone else as being there. The clear import of her testimony was that no one else was present. She warned deceased and defendant that if they did not stop arguing she would leave. When the argument continued, she did leave the house. She then testified, “I wasn’t out there no time.” When defendant came out of the house she asked him, “What you done to Mae Euth?” and he said, “Go in there and see about her, Mama.” This testimony indicates that whatever had been done to Mae Euth, defendant had done it. Consequently, Mrs. Suber’s testimony that Mrs. Patterson told her that “George had told her to go in and see about her granddaughter; that he had hurt her, she was either hurt or dead,” was not materially different in import from that of Mrs. Patterson.
Defendant never took the position at trial that he was not his daughter’s assailant. On voir dire he simply said that he did not sign the confession and that it was forced out of him. He never, even on voir dire, denied the truth of it. All the testimony. pointed unerringly to defendant as the killer. This assignment is overruled.
This Court on an appeal in a criminal action only reviews matters of law of legal inference, it not being the function of this Court to pass upon the credibility of witnesses or to weigh their testimony. North Carolina Constitution, Article IV, Section 12(1) ; State v. Hanes, 268 N.C. 335, 150 S.E. 2d 489 (1966) ; State v. Neill, 244 N.C. 252, 93 S.E. 2d 155 (1956). The verdict in this case is fully supported by the evidence. However, since the record discloses that the trial judge agreed to accept a plea of guilty of manslaughter, which defendant refused to enter, we commend the case to the Parole Commission for consideration of a recommendation for executive clemency.
An examination of the entire record discloses no error in law ■ sufficient to constitute a basis for awarding a new trial.