Wow. In Texas if you kill a man you might lose your job!

Four Houston police officers have been fired for fatally shooting an apparently emotionally disturbed man who was on the ground, wounded and incapacitated, before a final volley of 21 shots, officials said.

Police Chief Art Acevedo showed graphic bodycam video, later released publicly, and announced the department's findings into the April 21 shooting of 27-year-old man Nicolas Chavez.

Acevedo said Thursday that Chavez had been incapacitated by multiple Taser cartridges, bean bags and three gunshots before the four officers fired -- after he was down -- a total of 21 shots in the final moments of a 15-minute encounter.

Before the final burst of gunfire, Chavez is seen in video crawling and pulling at wires attached to a police Taser. "Don't do it," an officer is heard saying. The gunfire erupted as he cradled the Taser in his hand.

Acevedo said the two cartridges in the Taser had been discharged.

The chief, speaking hours after the police union condemned their termination, said the officers are appealing.

Acevedo said that even after repeated verbal warnings, the deployment of multiple soft impact rounds and the two Tasers, Chavez was still "armed with a metal object and began moving quickly toward" the officer who fired the first two shots.

But he called the barrage of gunfire at the end unreasonable.