The court reverses defendant's conviction after trial for murder of his estranged wife's lover. The court determines that testimony and an unabridged audiotape of defendant's invocation of the right to counsel, his refusal to consent to a search of his computer and car, and the interrogating officer's opinion that defendant was lying cumulatively constitute plain error. The court relies on federal and out-of-state case law to decide that a refusal of consent to search is inadmissible in these circumstances. Given the paucity of direct evidence of defendant's guilt, this improperly admitted evidence undermines the integrity of the verdict.