When a man is stabbed to death in front of a coffee shop, an unhinged "street person" named Lemonhead (Matthew Cowles) leads detectives Logan (Chris Noth) and Cerreta (Paul Sorvino) to the probable killer, a homeless man named Polesky (Stuart Rudin). Sure enough, the cops find the murder weapon in the Central Park clearing that Polesky calls "home." Unfortunately, the killer's prosecution may be stymied when the Defense argues that Logan and Cerreta didn't have a search warrant. ~ Hal Erickson, Rovi