A woman is in critical condition after she fell out of a moving truck onto an Alpine road early Sunday morning, according to a preliminary San Diego County Sheriff's investigation.
Officials say the woman was riding with a man who says he is her boyfriend in the 4000 block of Willows Road around 2:50 a.m.
For an unknown reason, the woman left the truck as it was still moving, falling to the road and receiving major head trauma.
The man told police he put the victim back in the truck and drove her to Grossmont Hospital.
She has since been taken to Sharp Memorial Hospital, and sheriff's officials say she is not expected to survive.
The Sheriff's Homicide Detail has opened an investigation into the incident. Willows Road was closed for a time while deputies gathered evidence.