OPINION
BUSSEY, Judge:The appellant, Sharon Kate Clark, was convicted of the crime of Second Degree Murder in the District Court of Cherokee County in Case No. CRF-80-108 and was sentenced to ten (10) years to life imprisonment, and she appeals.
In the summer of 1980 the appellant’s twelve-year-old son played on a little league baseball team and his step-father, appellant’s husband, was the coach. A group of mothers that frequently attended the games made remarks about the playing ability of several of the players, including appellant’s son.
Appellant testified that she thought of the women as a “gang” and believed that they wanted to “destroy” her son. However, the members of the group all testified that nothing extraordinary was said to appellant’s son, and each denied having anything against him.
On July 10, 1980, the appellant purchased a pistol and a box of cartridges. On July 15, she decided to pour motor oil on one of the women in retaliation for alleged derogatory remarks which she believed were made to her son. Before going to the ballpark that day, she concealed the revolver in her pants and filled a large cup with oil. After she arrived at the ballpark, she walked over to the bleachers and threw the motor oil in the face of one of the women. The victim, who was a guest at the game, immediately attacked the appellant, and the pair tumbled off the bleachers. As the two women struggled, the appellant shot and killed the victim.
Immediately after the shooting two men disarmed appellant and restrained her until the police arrived.
After the appellant shot the victim she exclaimed “oh damn, I shot the wrong bitch!” When asked what she thought her son would think of her actions, the appellant stated, “I left him at home.” The appellant also told the women that they should not pick on her son, but should pick on someone their own size. After uttering numerous vulgar and profane statements, the appellant told one of the women, “We got the wrong person, the bullet was meant for you,” and “I had no quarrel with his woman, I wanted to get the Murphy bitch.”
When the police arrived the appellant was transported to the police station where she became unruly and had to be carried up the stairs. In her cell, the appellant laid on the floor in a fetal position, cried, called for her “mama,” and remained non-communicative.
As her first assignment of error, the appellant contends that the trial court *377erred in conducting portions of her trial during her absence. The appellant was permitted to leave the courtroom at defense counsel’s request on two occasions, and she remained in a room adjoining the courtroom when the jury returned to the courtroom after deliberation because she believed people would laugh at her.
It is well settled that a defendant has both a statutory and a constitutional right to be present at all stages of his trial. 22 O.S.1981, § 583; Parker v. State, 556 P.2d 1298 (Okl.Cr.1976). However, when one voluntarily absents himself from the trial this right is waived. Roberts v. State, 523 P.2d 1150 (Okl.Cr.1974); Warren v. State, 537 P.2d 443 (Okl.Cr.1975). On all three occasions when the appellant was absent from the trial, she left voluntarily and on two occasions she left at defense counsel’s request. Appellant now alleges that the trial court should not have allowed her to leave the courtroom without any warning or inquiry. However, the United States Supreme Court rejected the same argument in Taylor v. United States, 414 U.S. 17, 94 S.Ct. 194, 38 L.Ed.2d 174 (1973), and held that:
Petitioner had no right to interrupt the trial by his voluntary absence, as he implicitly concedes by urging only that he should have been warned that no such right existed and that the trial would proceed in his absence. The right at issue is the right to be present, and the question becomes whether that right was effectively waived by his voluntary absence.
It is wholly incredible to suggest that petitioner, who was at liberty on bail, had attended the opening session of his trial, and had a duty to be present at the trial, see Stack v. Boyle, 342 U.S. 1, 4-5, 72 S.Ct. 1, 3-4, 96 L.Ed. 3 (1951), entertained any doubts about his right to be present at every stage of his trial. It seems equally incredible to us, as it did to the Court of Appeals, ‘that a defendant who flees from a courtroom in the midst of a trial — where judge, jury, witnesses and lawyers are present and ready to continue — v/ould not know that as a consequence the trial could continue in his absence.’ [United States v. Taylor,] 478 F.2d 689, 691 (1973).
We are of the opinion that the appellant was voluntarily absent from the trial, and waived her right to be present. This assignment of error is without merit.
In her second assignment, the appellant alleges that the trial court abused its discretion by failing to initiate a competency determination on its own motion. We disagree.
Title 22 O.S.1981, § 1175.2(A) states in pertinent part: “The Court may, at any time, initiate a competency determination on its own motion, without an application, if the court has a doubt as to the competency of the person.” The appellant argues that the testimony at trial concerning her past behavior during and subsequent to the slaying, and her outbursts of crying during the trial, should have raised a reasonable doubt as to her competency to stand trial. However, 22 O.S.1981, § 1175.1(1) defines “competent” or “competency” as
[T]he present ability of a person arrested for or charged with a crime to understand the nature of the charges and proceedings brought against him, and is able to effectively and rationally assist in his defense. (Emphasis added).
Both psychologists who testified, one of whom was appellant’s own expert, stated that they believed the appellant was presently competent to stand trial. This Court has held that the finding of the trial court will not be disturbed on appeal unless a clear abuse of discretion is shown, Beck v. State, 626 P.2d 327 (Okl.Cr.1981). Finding no abuse of discretion, this assignment of error is without merit.
Next, the appellant argues that the State presented insufficient evidence to prove that the appellant was sane beyond a reasonable doubt.
The M’Naghten rule is the test for insanity in Oklahoma. 21 O.S.1981, § 152. The initial burden is on the defendant to establish a reasonable doubt as to his sanity. Munn v. State, 658 P.2d 482 *378(Okl.Cr.1983). If the defendant establishes a reasonable doubt of his sanity, the presumption of sanity vanishes and it is incumbent upon the State to prove beyond a reasonable doubt that the defendant could distinguish between right and wrong at the time of the offense. Id. at 484.
In the present case, the appellant presented the testimony of a clinical psychologist who had interviewed the appellant nine (9) months after the murder and diagnosed her as psychotic. The expert testified that in his opinion the appellant could not distinguish between right and wrong at the time of the slaying. The appellant also presented the testimony of an attorney who attempted to interview her at the jail shortly after the shooting occurred. He testified that when he entered her cell he observed her lying on the floor in a fetal position. He further stated that he attempted to talk with her but that he received no response except for some mewing sounds, and that appellant began to call for her “mama.” The appellant testified that she thought of the women who attended the games as a “gang” and believed that they wanted to “get rid of,” “hurt” and “destroy” her son. She believed that they had access to weapons because one of them was a policeman’s wife. She testified that she remembered throwing the oil in the woman’s face and struggling with the victim, but that she did not remember shooting the victim or making any remarks after the shooting.
The State, on the other hand, presented the testimony of a clinical psychologist who did not personally examine the appellant, but who studied the psychological report prepared by the appellant’s expert. From that report, he concluded that the appellant's expert did not conduct sufficient testing to make a proper determination of the appellant’s sanity at the time of the offense. The State additionally introduced evidence to prove that appellant had taken several psychology courses in preparation for a Masters Degree in Education which she received in 1980. The State’s expert further testified that it is possible that a person could, in nine months from the time that the act was committed, develop a convincing presentation that would appear to be mental illness. Finally, the State introduced the testimony of lay witnesses who testified concerning the facts surrounding the shooting, including the actions and statements of the appellant.
The evidence presented is conflicting regarding appellant’s sanity at the time of the shooting; however, it is well established that:
On murder prosecution, the question of insanity at the time of the commission of the crime, presents a question of fact for the sole determination of the jury, and where there is any evidence tending to support the finding it is not the province of the appellate court to weigh the same. Nauni v. State, 670 P.2d 126, 133 (Okl.Cr.1983).
Moreover, this Court will not inquire into the credibility of the witnesses nor weigh conflicting testimony. Jones v. State, 479 P.2d 591 (Okl.Cr.1971).
In determining the issue of insanity, the jury must consider all of the evidence presented, not merely the testimony of the expert witnesses, and the weight and credibility of expert opinion is for the jury to determine and such testimony is not conclusive even where it is uncontroverted. Munn, at 486. The jury must determine the weight and credibility of both expert and lay witnesses in light of the particular facts and circumstances shown in the case. Id.
After carefully considering the record in the instant case, we are of the opinion that there is evidence which supports the jury’s conclusion that the appellant could distinguish between right and wrong when she shot the victim. Therefore, this assignment is meritless.
In her final four assignments of error, the appellant contends that the trial court’s instructions were not accurate and that they confused the jury. Specifically, appellant argues that the instructions on the defense of insanity, heat of passion manslaughter, second degree murder, and first *379degree manslaughter were confusing and contradictory. She further complains that the trial court erroneously failed to instruct the jury on the lesser included offense of misdemeanor manslaughter.
Initially, we note that the appellant did not object to the instructions given and did not submit requested instructions to the trial court. Therefore, this assignment was not properly preserved for appellate review. Thompson v. State, 705 P.2d 188 (Okl.Cr.1986).
Moreover, instructions given to the jury are left to the sound discretion of the trial court, and this Court will not reverse a jury conviction where the instructions viewed as a whole, fairly and accurately state the applicable law. Tate v. State, 664 P.2d 1036 (Okl.Cr.1983). We have carefully reviewed the record in the instant case and find that the instructions, when read in their entirety, fairly and accurately state the applicable law. These assignments lack merit.
Finding no error warranting reversal or modification, the judgment and sentence is AFFIRMED.
PARKS, P.J., concurs. BRETT, J., dissents.