What is the burden of proving intent to kill?

Jamison argues that the evidence relied upon to demonstrate his intent to kill Bolden was insufficient to support his murder conviction under N.Y.Penal Law 125.25, 105.15, 20.00. Jamison must carry a heavy burden in order to prevail on this claim. See United States v. Martinez, 54 F.3d 1040, 1042 (2d Cir.), cert. denied, --- U.S. ----, 116 S.Ct. 545, 133 L.Ed.2d 448 (1995). We view the evidence in the light most favorable to the government, and draw all permissible inferences in its favor. Id. Where, as here, the issue is one of intent, the question is whether "the inferences [in favor of the government] are sufficiently supported to permit a rational juror to find that the element, like all elements, is established beyond a reasonable doubt." Id. at 1043.