Point Blank (1967)

Mal Reese is in a real bind owing a good deal of money to his organized crime bosses and gets his friend Walker to join him in a heist. It goes off without a hitch, but when Reese realizes the take isn't as large as he had hoped, he kills Walker or so he thinks.

Some time later, Walker decides it's time to get his share of the money and starts with his ex-wife Lynne, who took up with Reese after the shooting. That leads him on a trail to his wife's sister Chris, to Reese himself, then onto Big Stegman, then Frederick Carter, then up the line of gangsters in an effort to get money from people who simply won't acknowledge that they owe him anything.