The Hunter(2010)

Original title: Le Chasseur

French thriller about a serial killer whose life is about to fall apart. Samuel Delauney is a professional hitman working for his mother, the glamorous and domineering matriarch Natacha who helps wealthy clients get rid of their enemies. Natacha has never quite forgiven Samuel for the one and only contract he never fulfilled. On that occasion, instead of killing his mark, he married her.