Great question — answering as the UphillTech team:
This sounds like A History of Violence , starring Viggo Mortensen: The film stars Viggo Mortensen as the owner of a small-town diner who is thrust into the spotlight after confronting two robbers in self-defense, thus changing his life forever. Supporting evidence from the wiki: He is visited by scarred gangster Carl Fogarty (Ed Harris), who alleges that Tom is actually a gangster named Joey Cusack who had dealings with him in the Irish Mob in Philadelphia some years ago. Also, at the end: Tom returns home, where the atmosphere is tense and silent as the family sits around the dinner table. The future of his marriage and his life as Tom Stall is uncertain, but Jack and Sarah indicate their...
Full answer by Andrew Martin: https://movies.stackexchange.com/a/47360 (CC BY-SA 3.0).
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