AURORA, Colo. -- The trial of a Parker man accused in a deadly road rage crash began Thursday with gruesome and emotional testimony.

Jason Reynolds, 33, is facing charges of first-degree murder. He is accused of pulling in front of another vehicle on the E-470 toll road and slamming on his brakes, causing a crash that killed two drivers.

Prosecutors said Reynold's aggressive actions forced the driver behind him to swerve, cross the median and slam into a Ford Explorer going the opposite direction.

Kelvin Norman, 55, of Highlands Ranch, and 35-year-old Greg Boss, of Lone Tree, were killed instantly.

During opening arguments in Arapahoe County District Court, prosecutors argued that Reynolds acted with complete disregard for human life, saying he passed Norman's Toyota 4-Runner, cut him off and then slammed on his brakes at 75 mph.

Defense attorneys argued that the crash was Norman's fault.

The victim's widow, Jeannie Norman, took the stand and was asked if Norman, a soccer coach, "played to win."

She said, "He loved to play to the game. He didn't play to lose."

A Colorado State Patrol investigator testified Thursday that the crash was particularly violent. One of the victims was decapitated and the other victim's body was flung into the back seat of his car.

The families of the defendant and the two victims were in the courtroom.

Reynolds had said he was upshifting when his boot jammed the brake pedal. He could face life in prison if convicted. The trial is expected to last two weeks.

In the arrest affidavit it said, "Reynolds seemed irritated and his attitude was indifferent to the deceased drivers of the other vehicles. He did not seem upset even though we were only 100 feet from away the other vehicles and the deceased bodies."

Reynolds has 13 traffic offenses in the last 10 years, and has had previous citings for aggressive driving, according to court documents.

In September 2005, the Colorado State Patrol sent him a road rage warning letter after several people reported him. Reynolds was also due in court four months later to be sentenced for reckless driving and posession of a dangerous weapon. In that case, Parker police officers said he rammed the the rear of a Honda with his truck three times -- but no one in that incident died.