I need help finding a movie. I've been searching for a long time with no luck

It starts with an undercover cop in a drug house when a woman turns up with her young daughter to get drugs but the dealer want to take advantage of the daughter. The cop intervenes while the dealer is undoing the girls overalls. The cop intervenes but the girl is shot as well as the drug dealer.

For some reason that drug dealer has been stuck in my head but I can't remember his name or the name of the movie.

Help please for the sake of my sanity.