Man arrested on suspicion of decapitating grandmother in California

A man has been arrested on suspicion of decapitating his grandmother and escaping the scene with her head.

Luis Gustavo Aroyo-Lopez, 23, was arrested in San Francisco on Saturday - two days after Elvia Lopez-Arroyo was found dead.

The 64-year-old was discovered at a property in Santa Rosa, just north of the city, after police responded to a call of a possible homicide.

Investigators believe it was a "targeted attack" and said multiple weapons were found at the scene - although the weapon used to kill the woman is still to be ascertained.

Aroyo-Lopez was caught at the Transbay Transit Center on Mission Street after a police officer on foot recognised him from a state-wide law enforcement alert.

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His grandmother's head was found on the south bank of the Santa Rosa Creek at about 7.30pm on the same day he was arrested.

Authorities said Aroyo-Lopez had recently been released from state prison, where he was serving time for assault with a deadly weapon, and was under community supervision.