ATLANTA (AP) — An Atlanta police officer responding to a minor car crash deployed a taser on a church deacon who disregarded multiple commands to sign a traffic ticket, shocking the man after he repeatedly said he could not breathe, police body camera video released Wednesday shows.

Johnny Hollman Sr. became unresponsive during his arrest late on the night of Aug. 10 and later died. An autopsy determined the 62-year-old’s death was a homicide, with heart disease also a contributing factor, and his family has called on prosecutors to charge Officer Kiran Kimbrough with murder. An attorney for Kimbrough, who was fired, says the officer acted lawfully.

The roughly hour-long video shows Kimbrough arriving at the scene of the crash and gathering information from Hollman, the other driver and a passenger before the confrontation.

Relatives have said Hollman was driving home from Bible study at his daughter’s house and bringing dinner to his wife when he collided with another vehicle while turning across a busy street just west of downtown Atlanta.

In the video, Hollman repeatedly insists the other driver hit him, but otherwise follows Kimbrough’s orders to move his car and stay by it. The encounter escalates after Kimbrough tells Hollman he failed to turn his white Chevrolet Silverado pickup correctly and was at fault for the crash.

Hollman immediately begins protesting, saying repeatedly, “I didn’t do nothing.” Kimbrough tells Hollman he can contest the finding in court, but he needs to sign the citation. He also accuses Hollman of screaming and repeatedly warns him that he will be jailed if he doesn’t sign.

Kimbrough’s attorney Lance LoRusso said in an emailed statement Wednesday that before the officer arrived, the other parties in the collision called 911 to report Hollman was disorderly and they were concerned for their safety.

“Mr. Hollman violently and unlawfully resisted Officer Kimbrough’s lawful efforts to arrest him,” LoRusso said. “The Atlanta Police investigation confirmed Officer Kimbrough deployed his city-issued Taser and used force in a manner consistent with his training and Georgia law.”

In the video, Hollman says he will sign the ticket after Kimbrough steps closer to him. Kimbrough’s body camera gets blocked, obscuring exactly what happens next, but the two men begin to struggle.

Kimbrough demands Hollman’s arm, but Hollman says his right arm hurts. Within seconds, Hollman is on the ground, saying he didn’t do anything and asking the officer why he’s doing this.

“I’m an old man. I’m an old man,” Hollman says.

Kimbrough yells at him to sign the ticket and says he is going to use his Taser on him.

“Put your hands behind your back now. Put your arms behind your back,” Kimbrough shouts before engaging his Taser in what police have said was a “warning arc.”

The tussling continues, with Kimbrough continuing to tell Hollman to put his hands behind his back and Hollman repeating over and over, “I can’t breathe.”

The officer then uses his Taser to shock Hollman — a manoeuver police have called a “drive stun.”

The video also shows the aftermath of the struggle. Another first responder arrives and helps Kimbrough get handcuffs on Hollman, who is lying face down and is no longer fighting. Kimbrough rolls Hollman over, checks his pulse and tells him to sit up. But Hollman is unresponsive, lying on the ground with a bloody face.