I'll Sleep When You're Dead — E.A. Aymar

Tom Starks has spent the three years since his wife's murder struggling to single-handedly raise their daughter, Julie, while haunted by memories of his dead spouse. When he learns that the man accused of her murder, Chris Taylor, has been released from prison, Tom hires a pair of hit men to get his revenge. But when the hit men botch the assassination, Tom is inadvertently pulled into their violent world.

And now those hit men are after him and his daughter.