Police are continuing to investigate the car-motorcycle accident that killed 20-year-old Tim Widmer, Iowa State sophomore in pre-business, last Friday.

Ames police said it may take a few weeks to establish the exact cause of the accident, and that alcohol is not believed to be a factor.

Widmer died after his motorcycle collided with a car driven by another ISU student, Michael Przytarski, in the 100-block of Lynn Avenue.

According to witnesses, Przytarski’s car, which was southbound on Lynn Avenue, collided with Widmer’s northbound motorcycle at 12:04 p.m. as the car was turning left into the Sigma Alpha Epsilon fraternity driveway, 140 Lynn Ave.

Widmer, member of Phi Kappa Psi fraternity and a native of Iowa City, was not wearing a helmet.

No charges have been filed against 22-year-old Przytarski, an ISU junior in finance and Sigma Alpha Epsilon fraternity member, who was not hurt in the crash.

Ames Police Chief Dennis Ballantine said three accident investigators currently are researching the incident.

“We do reconstruction; we try to determine the speed of the motorcycle and put together an actual [re-enactment] for a definitive answer to what happened,” Ballantine said.

He said collecting information at the scene of the accident, including skid marks, drag marks and road conditions, is an elaborate process.

“[We try to] come up with a good picture of what happened,” he said. “It takes quite a while. Normally, things would take a couple weeks on major accidents like this.”

Ballantine said it is difficult to determine which driver was at fault, and that police will focus on which traffic violations triggered the accident.

He added that the incident likely was not alcohol-related.

“We have no information to determine that alcohol was involved,” he said.

One witness said Widmer may have been speeding at the time of impact with Przyarski’s vehicle.

“Tim was coming down the street going really fast, maybe 45 to 50 miles per hour. Obviously he wasn’t paying good attention,” said one ISU student, who is a member of a sorority located near the scene.

“The driver was going into the driveway. Any person would’ve thought they had time to pull in,” she said.

The witness said she was uncertain which driver appeared to be at fault.

“[The driver] did look [before turning] because he paused for a minute, but the biker came up really fast,” she said. “I don’t think it should be the driver’s fault because the guy was going way too fast. It was kind of a no-fault accident.”

Chrissy Meyer, junior in journalism and mass communication and employee of the Small Business Development Center, 137 Lynn Ave., said a motorcyclist bearing resemblance to Widmer has been seen traveling at excessive speeds down Lynn Avenue in the past.

Meyer said the motorcyclist’s behavior had evoked concern among some business workers in the area.

“He’s usually going pretty fast,” she said.