Defendant contends first there is insufficient evidence to support the conviction because virtually no evidence existed to show recklessness. RCW 9A.32.060 provides:
(1) A person is guilty of manslaughter in the first degree when:
(a) He recklessly causes the death of another person;
(Italics ours.) RCW 9A.08.010(l)(c) provides:
(c) Recklessness. A person is reckless or acts recklessly when he knows of and disregards a substantial risk that a wrongful act may occur and his disregard of such substantial risk is a gross deviation from conduct that a reasonable man would exercise in the same situation.
The defendant properly cites State v. Green, 94 Wn.2d 216, 221, 616 P.2d 628 (1980), quoting Jackson v. Virginia, 443 U.S. 307, 61 L. Ed. 2d 560, 99 S. Ct. 2781 (1979), for the correct test in determining the sufficiency of the evidence: "whether, after viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt."' Green further explained that this inquiry does not require the reviewing court to determine whether it believes the evidence at trial established guilt beyond a reasonable doubt but rather whether any rational trier of fact could be so convinced.
Here, there was the eyewitness testimony of two people that the defendant dumped the contents of an ashtray on the unconscious victim. That evidence, together with the testimony of Charles Smith, who saw the defendant heave the victim onto the asphalt, and the doctor's testimony, was sufficient to support a belief that the defendant acted recklessly. There was evidence that the defendant did not trip, stumble or fall. Whether the defendant's knee actually went out, causing him to drop the victim, was a factual question for the jury. Judgment as to the credibility of witnesses and the weight of evidence is the exclusive function of the jury. State v. Braxton, 20 Wn. App. 489, 491, 580 P.2d 1116 (1978); State v. Blum, 17 Wn.