A History of Violence (2005)

When a pair of petty criminals attempt to rob his small-town diner, Tom Stall (Viggo Mortensen) quickly and easily kills them both. In the flush of news coverage of Tom's seemingly heroic actions, a threatening stranger named Carl Fogarty (Ed Harris) comes to town, fingering the unassuming family man as long-missing Philadelphia mobster Joey Cusack. To the horror of his wife, Edie (Maria Bello), and teenage son, Jack (Ashton Holmes), Tom finds he must confront his violent past.