DALLAS (CBSDFW.COM) – Dallas police say a woman in a wheelchair has died after a hit-and-run traffic accident.

The accident happened around 3 a.m. on Columbia Avenue, near Interstate-30 and Munger.

The name of the 57-year-old disabled woman has not been released. “She was actually in a motorized wheelchair, attempting the cross the street,” explained Corporal Kevin Janse with the Dallas Police Department. “Unfortunately she was not in a marked crosswalk. She was crossing in the middle of the street.”

Corporal Janse says investigators have no eyewitnesses or evidence and are looking for help. “We’re reaching out to the public in hopes that someone saw something, heard something, knows someone that confessed to this, and is willing to come forward and help us put some closure to this offense,” he said.

Apparently several witnesses heard what they thought was a traffic accident. When they went to investigate they found the woman lying on the ground.

The search continues for the hit and run driver.

(©2011 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)