Updated at 6:45 p.m. Thursday: Revised to include investigation updates.

Before he was killed during a car chase with police, a 15-year-old repeatedly hit his mother in the head with a baseball bat, police said.

Austin Schell died Wednesday afternoon in a crash in Farmersville while trying to flee Wylie police.

Wylie officers called to an apartment complex in the 100 block of S. Fifth Street just before 3 p.m., discovered a woman bleeding in the parking lot, police spokesman Sgt. Donald English said. Witnesses told police that the woman's son had been involved and fled by car, English said.

Police said the 15-year-old had struck his 40-year-old mother in the head with a baseball bat several times, causing severe injuries. She was taken to Medical City Plano, where she remained in the intensive care unit Thursday.

The woman has not been identified.

Officers chased the teen into Farmersville until a Farmersville officer spiked his tire. Schell lost control of the vehicle and crashed into a truck on State Highway 78, Farmersville Police Chief Mike Sullivan said.

"He went head on into a truck," Sullivan said.

Helicopter video from KTVT-TV (Channel 11) showed the teen's vehicle crashed into a truck hauling Port-O-Potties.

Police said there were no other injuries at the scene of the crash.

Originally, Farmersville police were leading the crash investigation with Wylie police assisting, English said. Wylie police asked the Texas Rangers to oversee the investigation to ensure transparency, English said.