WHEAT RIDGE - He thought she needed some help with her car, nothing more. He didn't expect to see a murder and have the killer look right at him.
"I thought that maybe she had fallen asleep or dozed off," he told 9NEWS on Wednesday. "I saw her veer off the road, off the right shoulder of the road and then hit the fence. I went over to try and help her."
9NEWS has chosen to not release his name because of what happened next.
The moment he got out of his car near 35th Avenue and Wadsworth Boulevard on Tuesday night, he noticed another man walk up to 34-year-old Amber Kathleen Cremeens' car and fire three shots.
"I looked up and then I saw him shoot her at point-blank range," the witness said. "He had tunnel vision. He had an agenda. He was out to kill this person."
"He was very nonchalant about it," he said. "I saw him turn toward me after he shot her. He looked right at me and he had no interest at all."
Wheat Ridge Police are now actively looking for Tyler James Martin, 35. They believe he's the man who killed Cremeens, his ex-girlfriend, along the side of Wadsworth Tuesday night.
"He's balding. He's got dark hair and brown eyes," said Lisa Stigall, the spokesperson for the Wheat Ridge Police Department.
She is hoping someone will be able to tell them where Martin is. She says he drives a green four-door Mercury Mystique with Colorado license plate No. 720-SXA.
"Often times the public is a big help in these situations," Stigall said.
The murder is something the witness will never forget.
"It's just terror. You see someone is in danger. You want to be able to help them and then there is nothing you can do about it," he said.
"I was just driving home from my mom's house," the witness said. "People say to me, 'Don't you feel lucky?' No, I don't feel lucky. That isn't how I see this at all."
Police say Cremeens was on the phone with a current boyfriend when all of this was starting to materialize. He called police shortly before the crash.
"He advised us that he was on a cell phone with her and she was telling him that her ex-boyfriend was following her and trying to run her off the road," Stigall said.
The boyfriend, who was talking with Cremeens, was trying to help her, trying to get her to turn onto side streets according to police, but apparently she was not able to shake her pursuer.
Court documents show that when Cremeens neared 35th and Wadsworth she "became hysterical and then the line (with her current boyfriend) went dead."
Police believe victim and Martin had been dating upwards of eight years. They also believe that the two had broken up back in August. Although there are no records of a restraining order in this case, court records suggest the victim had become increasing worried about her ex-boyfriend's behavior. The victim's current boyfriend has told police that "he had put (the victim's) bills and telephone in his name so that Tyler could not find her."
"My thoughts go out to the victim's family. It's just awful that any of us had to be a part of this," the witness said.