Dave (2017)

A lone contractor named Jack arrives at his house to find that all of his bodyguards have been shot to death by an unknown assailant. He makes his way into the basement where he finds Dave, an assassin he's hired out in the past, waiting for him. Dave holds Jack at gunpoint and reveals that he found out that Jack hired someone to kill him. Dave tries to get Jack to tell him why he did it, but a close quarters fight breaks out between the two, ending with Dave shooting Jack in the head. In the end, Dave walks away relatively unscathed, but now has to live with killing the man he once thought was his closest ally.