A woman was found dead in a car with shattered windows on an Escondido freeway off-ramp Monday afternoon, authorities said.

Investigators are working to determine how she died.

A passerby called 911 about 1:10 p.m. after spotting the woman, unresponsive and with blood on her body, in the car on the north Interstate 15 off-ramp to El Norte Parkway, authorities said. Medics determined the woman was dead.

The two front windows of the four-door Mercury sedan were shattered, but investigators did not know how or when the windows were broken. Escondido police Lt. Ed Varso said there were no indications a crash occurred.

He said the woman was bleeding from her head, but it was unclear how or where on her body she was injured.

The Medical Examiner's Office will determine how she died. She was not identified.