DALLAS, Texas -- Testimony began Tuesday in the trial of a former Garland police officer charged with manslaughter in a 2012 incident in which he shot at a suspect 41 times.

It all started when Patrick Tuter, a six-year veteran of the force at the time, recognized Michael Allen's truck from another police chase earlier that week. He tried to pull him over, which led to a chase through multiple cities, ultimately ending in gunfire.

Prosecutors called Tuter "reckless," saying that seasoned officers will testify he went beyond what was necessary. Allen didn't have a weapon in the vehicle.

"He went past Garland’s way of taking care of things and went to Patrick Tuter's way of taking car of things," said prosecutor Juan Sanchez.

Tuter was fired after an internal investigation.

But defense attorney Robert Rogers said Tuter feared he would die if he didn't use deadly force, painting Allen as a dangerous felon who had meth in his system.

Allen's mother, Stephanie, was the first to take the stand Tuesday, tearfully remembering the day she learned her son had died.

"We were ... devastated," she said,"

Then, Lt. Clay Lacey, of Texas DPS, took the stand. He was in the DPS chopper the night of the chase and answered questions about chopper surveillance video. He estimated the chase topped 80 to 100 mph at some points.

Surveillance video
Surveillance video

Ultimately, Allen wound up in a Mesquite cul-de-sac, with Tuter on his tail, and multiple other police vehicles behind them.

The two vehicles collided and ended up front to front. A second police vehicle then struck Allen's truck, sandwiching him in. The surveillance video appears to show Allen continue to accelerate.

Defense attorneys say Allen bent down to reach for something and that's when Tuter feared for his life and fired shots. They said he fired until Allen stopped accelerating and the threat was over.

"He had to do what he had to do in order to survive," Rogers said.

But prosecutors argue Allen had his hands on the wheel and was trying to leave.

More officers are expected to testify.

The trial could stretch into next week.