An inmate on death row at San Quentin was found dead in his cell on Saturday morning, according to authorities.
Around 6:17 a.m., 35-year-old Miguel Angel Magallon was found unresponsive. Lifesaving measures were performed, but he was pronounced dead at 6:49 a.m.
The cause of death is unknown at this time but officials say an autopsy will be done.
The 35-year-old was sentenced to death in Los Angeles County in 2009 for the murder of Captain Michael Sparks Sr. with the Los Angeles County Office of Public Safety in 2004.
Sparkes was taking his regular early morning bike ride in a neighborhood near his Compton home when Magallon approached on foot to rob him and shot Sparkes multiple times before fleeing to a waiting car.
Prosecutors say Sparkes was able to call 911 but Magallon returned with another man and fatally shot Sparkes.
Getaway driver Orvis Camillo Anthony was sentenced to 50 years to life.
He has been on death row since Oct. 26, 2009.
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