What movie is this called??

Question

Its like where this sand is like super valuble, and aparently this guy has alot of it or stole it or something and when he doesnt give it to him, their after the family and they kill the sister, [whos working out], they kill the mom, [whos in the bathtub], and the dad, and the youngest girl whos around twelve was out getting some milk, and so they didnt kill her.

But there was this savior guy who lived next door and when she found out her family was dead, she went over there and then they had some relationship during the movie and he died at the end.

Answer 1

The is "Leon" or "The Proffesional", or "Leon: The Professional"

With Natalie Portman as the girl, Gary Oldman as the corrupt DEA agent team leader and Jean Reno as the Proffesional hitman or "cleaner".

Valuable sand?  It was a drug, cocaine.  

The younger victim was a kid brother of Mathilda, the girl.

Answer 2

the professional

Answer 3

Leon - The Professional

Answer 4

The Professional - excellent movie!