Diego Preciado, 25, faces a charge of murder after police say he choked his grandfather to death on Monday.
The victim has been identified as 72-year-old Oscar Taylor, according to the medical examiner.
Police said Taylor's wife, Preciado's grandmother, tried to intervene but was unable to stop Preciado.
When officers arrived at the home where they'd gotten a 911 call from, Taylor was found unconscious.
Paramedics tried to revive him, but he was pronounced dead shortly afterward.
Preciado remains in jail on a $500,000 bond.
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