AURORA, Colo. -- A Lone Tree man said he feared for his life when a car cut him off on E-470 almost a year and a half ago. The car was registered to Jason Reynolds, a Parker man who's now on trial for killing two men during a road rage incident on E-470 several months later.

Reynolds is charged with two counts of first-degree murder for a deadly crash on Nov. 8, 2005.

On Friday, the second day of the trial, prosecutors focused on a Sept. 9, 2005 incident. They argued it demonstrates that Reynolds has a pattern of aggressive driving.

Stephen and Mary Faith Forbes said that the driver in that September incident pulled in front of their car and slammed on the brakes.

"He made a nasty gesture and got right in front of us and stomped on his brakes -- hard," Mary Faith Forbes told 7NEWS. "Boy, it was close call for us. We are lucky to be alive."

The Forbes wrote down the license number of the car that sped off and reported it to police. That car was registered to Reynolds. The Colorado State Patrol did not interview the Forbes until after the deadly crash in November on the same stretch of road.

Testifying on Friday about his close call, Stephen Forbes said, "This individual was using his car as a weapon and wanted to cause us harm. I was scared and this individual was dangerous."

Prosecutors argued that Reynolds, driving in similarly reckless fashion, triggered a crash that killed Kelvin Norman and Greg Boss on that same road two months later.

Prosecutors said when Reynolds passed Norman's Toyota 4-Runner, cut him off and then slammed on his brakes at 75 mph, Norman was force to swerve into oncoming traffic and into Boss' vehicle.

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

"I feel really bad for these families. This didn't need to happen at all. It was just a waste," Mary Kate Forbes said.

After the September incident, the CSP sent a letter to Reynolds saying that a vehicle registered to him had engaged in dangerous acts of driving. There were several incidents reported to the state patrol that were linked to the same car.

Reynolds' attorney argued that there's no proof he was behind the wheel in any of those incidents.

Reynolds has pleaded not guilty in the murder case. According to a state trooper, Reynolds blames his boots for accidentally jamming the brake pedal. Reynolds blames Norman for the crash.

Reynolds could face life in prison if convicted. The trial is expected to last two weeks.