The Professional (Leon) 1994

A corrupt Drug Enforcement Administration boss and his thugs murder Natalie's family in a drug deal gone awry. Orphaned by the massacre, Natalie is forced to take shelter in the apartment of a neighbor, Leon, whom she knows only slightly. He's a loner and first generation immigrant, who also happens to be a professional hit man. He's never had reason to care about anybody, and she has no one else to turn to. Together they form a makeshift father and daughter bond that will forever change both their lives.