Richard Ramirez, the notorious serial killer known as the Night Stalker, died early Friday in a hospital, a state official said.
Ramirez, 53, "passed away this morning," San Quentin State Prison spokesman Lt. Sam Robinson told The Associated Press. No other details were released.
The Department of Corrections and Rehabilitation said Ramirez died of "natural causes." He had been housed on death row for decades and was awaiting execution, even though it has been years since anyone has been put to death in California.