Officer Down (2013) on Netflix

Plot summary

Detective David 'Cal' Callahan lives in Bridgeport, Connecticut with his wife, Alexandra, and their teenage daughter, Lanie. Cal has left behind drugs and alcohol, and a drug dealer once shot him before a stranger saved his life. In a bar, that stranger gives Cal the journal of a daughter who has died. The stranger says that Angel, a night-club regular, beat and raped her, and that the club belongs to Royce Walker, a drug dealer. Cal looks into Angel, and when he sees the man near Lanie's school, he decides to act.