LYNDON TOWNSHIP, MI - Police have identified a U.S. Postal Service mail carrier pinned and killed by her own mail truck on Wednesday, March 21 in Washtenaw County's Lyndon Township.

Tracy Sylo, 56, of Pinckney was killed in the crash about 1:30 p.m. while trying to deliver a package to a residence on Blind Lake Road, according to a release by Michigan State Police.

Her truck was parked at the top of the driveway when it rolled down and pinned her against a metal guardrail, according to the release.

Sylo was pronounced dead at the scene.

The home where the incident occurred sits on a hill and the handrail runs along a set of steps that lead to a lake behind the home, Chelsea Area Fire Chief Robert Arbini said.

"We don't know if it rolled or maybe it was in neutral or if the parking brake went out," Arbini said of the truck Wednesday. "We have no idea how the person got wedged between this particular vehicle and the handrail."

Elizabeth Najduch, USPS strategic communications specialist, released a statement to The Ann Arbor News Thursday afternoon on behalf of the postal service.

"The postal service is deeply saddened by the loss of one of our employees," she said. "Our thoughts and prayers are with her family and friends during this most difficult time. The Employee Assistance Program is available to all USPS employees and their families."

The incident remains under investigation.

Anyone with information on the incident is asked to contact the MSP Brighton Post at 810-227-1051.