L.A. man who killed cop in 2004 found dead in death row cell
KTLA / California Department of Corrections
Miguel Magallon appears in an undated booking photo.

via KTLA:

SAN QUENTIN, Calif. (KTLA) -- The killer of a California police officer has died after being found unresponsive in his cell at San Quentin State Prison.

Miguel Magallon, 35, died Saturday despite emergency measures. An autopsy will be conducted, corrections officials said Monday.

Magallon was sentenced to death on Oct. 15, 2009, for the Aug. 10, 2004, murder of Capt. Michael Sparkes Sr. of the Los Angeles County Office of Public Safety.

Prosecutors in the case said Sparkes, 53, was taking his regular predawn bike ride in a neighborhood near his Compton home when Magallon, then 26, stepped out of a vehicle and tried to rob him. He shot the officer multiple times with an AK-47 before fleeing to a waiting car.

MORE: L.A. Man Who Killed Police Officer in 2004 Found Dead in His Death Row Cell in San Quentin: CDCR - KTLA