concluding that "the mere avail-ability of defendant's offered stipulation as an alternate form of proof did not render" post-mortem photographs of the victim irrelevant

concluding that, because post-mortem photographs were relevant to prove more than the defendant stipulated, the trial court did not err in declining to limit the state to the defendant’s stipulation

explaining that a defendant's stipulation is an alternate form of proof but does "not have the effect of making otherwise relevant evidence irrelevant"