Whole Nine Yards (2000)

A mobster named Jimmy the Tulip (Bruce Willis) agrees to cooperate with an FBI investigation in order to stay out of prison; he's relocated by the authorities to a life of suburban anonymity as part of a witness protection program. It's not long before a couple of his new neighbors (Rosanna Arquette, Matthew Perry) figure out his true identity and come knocking to see if he'd be up for one more hit, suburban style.