San Marcos police said a 19-year-old man died on Christmas Day after his car went off the roadway and struck a utility pole.

Police said David Whitlock died from his injuries at University Medical Center at Brackenridge in Austin after being taken there by medical helicopter Tuesday night.

The wreck occurred around 10:40 p.m. in the 1800 block of Post Road, police said.

He was driving alone when he wrecked his 2003 Chevrolet Cavalier, investigators said.

The cause of the accident is under investigation.