Defendant brings forward assignments of error relating to the sufficiency of the evidence, the admission of evidence, the jury instructions and the sentence. For the reasons stated herein, we find no prejudicial error.
[1] In his first assignment of error defendant argues that his motion to dismiss should have been allowed because the uncontradicted evidence showed, as a matter of law, that defendant killed Charles Rathbone in the exercise of his right of self-defense or defense of his wife. A thorough review of the evidence compels us to reject this contention.
Upon a defendant’s motion to dismiss, the question before the court is whether there is substantial evidence of each essential element of the offense charged, and that defendant was the perpetrator of the offense. State v. Powell, 299 N.C. 95, 261 S.E. 2d 114 (1980). The evidence must be considered in the light most favorable to the State and the State is entitled to every reasonable inference arising from the evidence. Id. When the State’s evidence and defendant’s evidence tend only to show that defendant acted in self-defense, then defendant’s motion for non-suit should be allowed. State v. Johnson, 261 N.C. 727, 136 S.E. 2d 84 (1964). Similarly, the motion for nonsuit should be allowed when the uncontradicted evidence shows that defendant killed the decedent in defense of a family member. State v. Carter, 254 N.C. 475, 119 S.E. 2d 461 (1961). However, the right to kill in defense of one’s self or family member is not absolute. When one uses excessive force in the exercise of his right of self-defense, he loses the benefit of perfect self-defense and is guilty at least of voluntary manslaughter. State v. Norris, 303 N.C. 526, 279 S.E. 2d 570 (1981). Where the evidence is conflicting with respect to the issue of whether the force used by a defendant was excessive under the *63circumstances, the question is properly submitted to the jury. State v. Clark, 65 N.C. App. 286, 308 S.E. 2d 913 (1983), disc. rev. denied, 310 N.C. 627, 315 S.E. 2d 693 (1984).
In the instant case, while defendant’s testimony was to the effect that he fired three times at Charles after Christine had fallen to the floor, the State offered evidence that defendant had fired four shots and that two bullets had been shot through the bedroom door. Powder burns on the outside of the door indicated that the shots had been fired from the hallway into the bedroom through the closed door. Charles was found dead in the bedroom with an empty pistol; he had been shot four times, once in the back. This evidence permits an inference that defendant shot Charles in the back as he was retreating with an empty pistol and twice more through the closed door; the evidence is therefore sufficient to carry the case to the jury on the question of whether defendant used excessive force in self-defense. In addition, defendant’s statement to Boyd Norton that he had shot Charles because “He came in and tried to take over” is inconsistent with defendant’s claim of self-defense. We therefore hold that the court did not err in denying defendant’s motion to dismiss.
[2] By his second assignment of error defendant contends that the trial court erred in permitting the prosecutor to question defendant about the facts of a prior assault conviction. On direct examination, defendant testified that he had been convicted of assault in Utah. On cross-examination, the following exchange occurred:
Q. That conviction of assault, did that involve a shooting?
Mr. Huff: Objection.
The Court: Overruled.
Q. Did it involve you shooting someone?
A. Yes.
Q. You spent time in prison for it?
A. Six months in jail.
For purposes of impeachment, a witness, including a defendant, may be cross-examined with respect to prior convictions. G.S. 8C-1, Rule 609(a); State v. Finch, 293 N.C. 132, 235 S.E. 2d 819 *64(1977). Where the conviction is established, there may be further inquiry into the time and place of the conviction and the punishment imposed. Id. This Court has held that inquiry into prior convictions which exceeds the limitations established in Finch is reversible error. State v. Greenhill, 66 N.C. App. 719, 311 S.E. 2d 641 (1984) (prosecutor inquired into weapons used and gender of victims in thirteen prior assaults); State v. Bryant, 56 N.C. App. 734, 289 S.E. 2d 630 (1982) (defendant admitted conviction for larceny, prosecutor proceeded with questions concerning details of theft of police radio from police station and defendant’s use of the radio thereafter).
In the instant case, defendant testified on direct examination that he had been convicted of assault. The prosecutor’s question as to whether the assault involved a shooting was basically no more than an inquiry into whether the conviction was, in reality, one for a more serious offense, i.e., assault with a deadly weapon. Once defendant admitted that it was, the prosecutor did not press for the details and merely inquired as to punishment, as permitted by Finch. Even if the inquiry transcended the bounds of Finch, we do not believe the error to be of such magnitude as to require a new trial under the test of prejudicial error contained in G.S. 15A-1443(a). Under the circumstances of this case, it is highly improbable that the evidence tended, as defendant asserts, “to lead the jury to convict defendant because he was prone to assault others by shooting them.”
[3] In his third assignment of error defendant argues that the trial court erred in overruling defendant’s objections to questions concerning his assault on Delbert Reed. Defendant contends that this testimony was irrelevant and highly prejudicial. Defendant, however, testified to the same incident on direct examination. When evidence is admitted over objection and the same evidence has already been admitted, or is subsequently admitted without objection, the benefit of the objection is lost. State v. Tysor, 307 N.C. 679, 300 S.E. 2d 366 (1983); 1 H. Brandis, Brandis on North Carolina Evidence § 30 (2d rev. ed. 1982).
[4] Defendant next contends that the trial court erred in instructing the jury that defendant was not entitled to the benefit of self-defense if he was the aggressor or if he used excessive force. We first note that defendant failed to object to the instruc*65tion at trial, as required to preserve this issue for appellate review. N.C.R. App. P. 10(b)(2). Defendant contends, nevertheless, that the instruction was plain error and is reviewable on appeal even in the absence of timely objection. The plain error rule, adopted by our Supreme Court in State v. Odom, 307 N.C. 655, 300 S.E. 2d 375 (1983), defines plain error as follows:
[T]he plain error rule ... is always to be applied cautiously and only in the exceptional case where, after reviewing the entire record, it can be said the claimed error is a “fundamental error, something so basic, so prejudicial, so lacking in its elements that justice cannot have been done,” or “where [the error] is grave error which amounts to a denial of a fundamental right of the accused,” or the error has “ ‘resulted in a miscarriage of justice or in the denial to appellant of a fair trial’ ” or where the error is such as to “seriously affect the fairness, integrity or public reputation of judicial proceedings” or where it can be fairly said “the instructional mistake had a probable impact on the jury’s finding that the defendant was guilty.”
Id. at 660, 300 S.E. 2d at 378 (quoting United States v. McCaskill, 676 F. 2d 995, 1002 (4th Cir.), cert. denied, 459 U.S. 1018, 103 S.Ct. 381, 74 L.Ed. 2d 513 (1982) (footnotes omitted)). In short, this rule waives Rule 10(b)(2) and allows review of fundamental errors or defects in jury instructions affecting substantial rights, which were not brought to the attention of the trial court. See also State v. Brown, 312 N.C. 237, 321 S.E. 2d 856 (1984).
The plain error rule does not negate Rule 10(b)(2) and, as explained in Odom, rarely will an improper instruction which was not objected to at trial justify reversal. Instead of the standard of prejudicial error contained in G.S. 15A-1443, we must determine whether the jury instruction complained of was erroneous, and if so, whether it had a “probable impact” on the jury’s verdict.
Voluntary manslaughter is the unlawful killing of a human being, which is done without malice and without premeditation and deliberation. State v. Norris, supra. One who kills a person while in the heat of passion, on sudden and sufficient provocation, is guilty of voluntary manslaughter. State v. Chamberlain, 307 N.C. 130, 297 S.E. 2d 540 (1982). Additionally, a killing in the exercise of self-defense, but which fails to meet the standard of *66perfect self-defense because the defendant was either the aggressor, without murderous intent, or used excessive force, is voluntary manslaughter. Norris, supra. In the instant case the trial judge instructed the jury on imperfect self-defense as follows: “you may convict the defendant of voluntary manslaughter, if the State proves that the defendant was simply the aggressor without murderous intent in bringing on the fight in which the deceased was killed or that the defendant used excessive force.”
While this is a correct statement of the law, defendant contends that he was prejudiced because there was no evidence that he was the aggressor or that he used excessive force. He argues that since the court’s instruction permitted the jury to base their verdict on a finding, unsupported by the evidence, that he exercised imperfect self-defense, he is entitled to a new trial. We disagree.
In this case, there is plenary evidence to support the jury’s verdict finding defendant guilty of voluntary manslaughter on the grounds of a killing committed in the heat of passion or, as previously discussed, committed by the use of excessive force in the exercise of self-defense. We also believe that defendant’s statement that he shot Charles after Charles “came in and tried to take over” supports a reasonable inference that defendant initiated the exchange of gunfire, rendering the court’s instruction on “first aggressor” appropriate. However, even if we were to assume, arguendo, that the evidence was insufficient to warrant the “first aggressor” instruction, any error in giving the instruction could not have had a probable impact on the jury’s verdict in view of the evidence supporting defendant’s use of excessive force. Finding no “plain error” in the court’s instructions and defendant having failed to object thereto, we must overrule this assignment of error.
[5] Finally, defendant assigns as error the failure of the trial judge to find three statutory mitigating factors, ex mero motu. In State v. Gardner, 312 N.C. 70, 320 S.E. 2d 688 (1984) our Supreme Court stated the rule that the duty of the trial judge to find a statutory mitigating factor that has not been submitted by defendant arises only when defendant meets the burden of proof established in State v. Jones, 309 N.C. 214, 306 S.E. 2d 451 (1983), *67 Le., the evidence in support of the statutory factor must be substantial, uncontradicted and manifestly credible.
Defendant first contends that the trial court erred in failing to find the factor listed in G.S. 15A-1340.4(a)(2)(1): that at an early stage in the criminal process defendant acknowledged wrongdoing to a law enforcement officer. We find no evidence that defendant ever acknowledged wrongdoing. To prove this mitigating factor defendant must have admitted culpability, responsibility or remorse, as well as guilt. State v. Brewington, 71 N.C. App. 442, 322 S.E. 2d 205 (1984). Instead, defendant has consistently maintained that he shot Charles in self-defense or defense of his wife.
Defendant next contends that the trial court erred in failing to find the factor in mitigation listed in G.S. 15A-1340.4(a)(2)(b), that he committed the offense under compulsion. We find no evidence of compulsion in the record.
Defendant finally contends that the court erred in failing to find that he acted under strong provocation, as set forth in G.S. 15A-1340.4(a)(2)(i). The question before us is whether the evidence of strong provocation is substantial, uncontradicted and manifestly credible. As we have discussed, differing inferences may be drawn from the evidence as to who initiated the altercation between defendant and his deceased brother. • Although the testimony of defendant and his wife, if believed, would certainly tend to show strong provocation, we cannot say that it was manifestly credible so that the court was compelled to accept it as true. We find no error in the sentence.
No error.
Judges ARNOLD and WELLS concur.