The District Attorney's Office has now charged John Kelly with murder

PHILADELPHIA (WPVI) -- UPDATE: Charges downgraded in fatal Center City Philadelphia shooting due to video evidence
New details have been released in a deadly shooting in Center City Philadelphia, that was all caught on camera.
The crime happened Friday on 12th and Chestnut streets.
Sources tell Action News it started with a fight between a homeless man and his girlfriend.
They say the woman who was killed initially tried to intervene and pulled out her own gun.

That's when the man started fighting with the victim.
Detectives believe he eventually disarmed the woman, and shot and killed her with her own gun.
The District Attorney's Office has now charged John Kelly with murder.

Anyone with information can call or text Philadelphia police at 215-686-TIPS (8477) or submit an anonymous tip online.