The 33-year old Springfield man was found severely injured in the middle of a street in West Eugene.
It happened near South Danebo and 11th Avenue around 11:30 p.m.
A witness called police after finding the man with traumatic injuries. His blue BMX bike wasn’t far away.
Investigators say Charles Lewis Irwin died, after he was rushed to the hospital.
There were no other vehicles around and police are still looking for witnesses to try to find out what happened.
“We are working under multiple theories at this point. It could have been a multiple vehicle crash. It could have been this person crashed off his bicycle. It could have been a violent assault. We are still working on those,” said Eugene Police Officer Scott Dillon.
Last year, Irwin was arrested multiple times for failing to register as a sex offender.
If you have any information call the Eugene Police Department.