Police say a Buena Park Police Department patrol car was headed westbound on Orangethorpe Avenue approaching Oregon Street Saturday at about 1 a.m. when the officer noticed a body on the road.
The woman was identified as 33-year-old Katherine Tinnell.
"The officer had no time to react and struck Ms. Tinnell," according to a police report.
It's not yet known if Tinnell was alive at the time she was struck by the police vehicle. Police do not know why she was lying in the roadway.
The investigation is ongoing.