The Stone Killer

The Stone Killer is a 1973 film starring Charles Bronson and directed by Michael Winner. It came out in between The Mechanic and Death Wish, all three of which teamed up actordirector Bronson and Winner. Norman Fell and John Ritter appear as cops in this film, not too long before the TV series Threes Company. Character actor Stuart Margolin plays a significant role he also appeared in Death Wish.

Bronson plays a gritty, independent detective who stumbles across the plot when a washedup former hit man is killed under circumstances that make it clear that it was an inside job and that Mafia were involved. He then slowly uncovers the clues that point to a seemingly impossible plot.

Source: Wikipedia