Two inmates on death row in California, including a serial killer, are believed to have committed suicide over the weekend, officials said on Monday.
Staff at San Quentin State Prison found Andrew Urdiales, 54, unresponsive and alone in his cell late Friday and were unable to revive him, officials said in a statement.
Late on Sunday, the second inmate, Virendra Govin, 51, was also found dead, they added.
Both deaths are being treated as suicides, prison officials said, adding that there was no indication the two incidents are related.
Urdiales was sentenced to death on October 5 of this year for a string of murders dating back to as far as 1986. The killings took place while he was stationed at various US Marine Corps facilities in southern California.
He was placed on death row on October 12.