To Kill a Killer(2007)

Salomon Caramona and Lyndsey Jimenez are a hit-man and his wife who have to flee Mexico to Chicago when Caramona doesn't finish a hit. Unknown to him, the man that hired Caramona for the original hit, tracks him down in Chicago and is willing to forgive the original hit if the former assassin will find a serial killer that tortured and murdered his daughter.