Richard Winters

Winters were a suspect in the deaths of Ives & Henry, and had offered to cooperate. He was killed by a shotgun blast to the face during a "robbery" in July 1989, which was subsequently proven to be a setup.
Dan Harmon, the Prosecutor who Winters reportedly made the offer to, has since been implicated in the Kevin/Ives deaths and is now in jail for running his office as a racket.