Detectives Briscoe and Curtis investigate the murder of Tony Legrasso, a former mafia hit man who is found dead in Central Park with six bullets in the chest. It takes the police some time before they identify him however as he had been living in another state under the federal witness protection program. He was continuing to cooperate and was scheduled to give evidence against top mob boss Alberto Napoli who ordered one of his men, Johnny DeMayo, to eliminate him. DeMayo is cooperating with the DAs office but Napoli's lawyer claims his client is mentally incompetent as a result of a recent stroke. McCoy thinks Napoli's illness is all an act. He then concludes that DeMayo isn't the shooter so they go back to square one.
—garykmcd