Directed by Luc Besson, Léon: The Professional stars Jean Reno as a solitary contract killer whose life changes when twelve-year-old Mathilda, played by Natalie Portman in her film debut, seeks refuge after her family is murdered. As Léon teaches her the skills of his profession, the pair become targets of Gary Oldman’s corrupt and unpredictable DEA agent Stansfield. Set in New York, the film combines hitman action, crime thriller and revenge with the unlikely relationship between its two central characters.

Från IMDB:
An Italian hit man protects a New York orphan.