CHESTER, Calif. (AP) - A 20-year-old man who crashed his truck into a stand of pine trees as he headed home after learning his sister had been killed has died, hospital officials said.

Billy Carrigan died Tuesday at Enloe Medical Center in Chico, said Christina Chavira, a hospital spokeswoman . He had been in critical condition at the hospital since Sunday, when he got into the accident along Highway 36 outside his hometown of Chester, about 150 miles north of Sacramento.

Carrigan's sister, Jennifer, and her friend, Steven Furtado, had been found dead Sunday afternoon inside the family's home. Jennifer Carrigan's mother found the pair in her daughter's bedroom.

Early reports said the couple, both 18, had gone to prom the night earlier but Sgt. Greg Hagwood said there was no indication they went to the high school dance.

Jennifer Carrigan's ex-boyfriend, 18-year-old Reyes Carrillo, was arrested in connection with the deaths. Hagwood said Jennifer Carrigan and Carrillo had dated for several years and broke up within the last couple of months.

Hagwood would not say how Jennifer Carrigan and Furtado died.
Autopsies were being conducted.

"There were indications of a struggle and it became readily apparent we had a crime scene," Hagwood said.

Billy Carrigan was a student at the University of California, Berkeley. The car accident occurred when he lost control of his pickup truck while driving around a sharp curve on his way home.

(Copyright 2008 by The Associated Press. All Rights Reserved.)