@OraOraApril19 maybe, it actually make a bit of sense, since he might have been a hitman belonging to a specific group, you can't quit then but freelance hitmen can quit whenever, but you don't have the group backing you up should things go sour.
@Banarok Even if you fancy yourself a freelance hitman, you'd have still worked for the organised crime. If you decide to quit, there could be people who think you know too much. No loose ends, and all that.