A Colorado cop socked an unruly woman in the face while she was in handcuffs … and the assault was caught on video, leading to the officer’s firing.

Loveland Police Chief Tim Doran released the body cam footage Friday, which showed Russell Maranto and his fellow officers escorting Angelia Hall into a hospital room on May 20. Hall was taken to the medical center for evaluation after she was placed in protective custody for wandering in traffic and mumbling to herself.

The clip begins with Hall parking herself in a chair with her hands cuffed behind her back and getting belligerent with the cops, shouting and cursing at them.

Maranto rips a piece of paper out of Hall’s hand and walks away with it. As a result, Hall goes berserk, demanding her paper back as Maranto returns to try to calm her down.

But Hall can’t contain her anger and hocks a loogie at Maranto, who then slams his fist into her face, causing minor injuries.