Prosecutors also released disturbing new details about how the two victims were killed.
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The suspect, 25-year-old Rahmad Parke, was arrested in Los Angeles County on January 15 and later booked in the Fresno County Jail.
Officials now say on January 5, Parke used a pair of scissors to stab his grandfather, 90-year-old Mel Abdalaziz, multiple times.
RELATED: Family of mother, grandfather killed in Fresno County plead for 25-year-old to turn himself in
His body was found in the front yard of a house on Tulare and Peach. Parke then allegedly used pieces of a broken chair to hit his mother, 58-year-old Melba Abdelaziz, multiple times, causing her death.
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Parke has been charged with two counts of murder along with two enhancements and a special circumstance. He faces a possible death sentence or life in prison without parole, if convicted.
His arraignment is scheduled for January 24.