Santa Rosa police say 24-year-old Luis Gustavo Aroyo-Lopez was taken into custody in San Francisco Saturday morning.
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Police said they responded at 3:40 p.m. Thursday to the 2500 block of Pomo Trail in Santa Rosa regarding a possible homicide. Officers arrived to find a woman inside the residence who had been decapitated.
The victim's head was not located at the residence.
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Investigators believe Aroyo-Lopez, who is related to the victim, killed her and fled the scene. Police believed Aroyo-Lopez took the victim's head with him, but have not updated on whether it was found when he was taken into custody.
Police say further information will be shared at a later time as it is still an active investigation.
Bay City News contributed to this report.