John:
You've never killed anyone but a few of your patients have died while under your help/care

Amanda:
Seth Baxter when you and Mark put him in a fake Jigsaw trap.

Mark:
Peter Strahm when he was coming after Mark (you tricked him into going into the trap that killed him)

Lawrence:
No one

Adam:
Mark Hoffman when you put him in the bathroom trap

Daniel:
You don't have the heart