Updated

A man was arrested in Livermore, Calif., Wednesday on suspicion of stabbing his grandmother and mother, police said.

The man's grandmother succumbed to her injuries. His mother's injuries were not life-threatening, police said.

At 7:38 p.m., police found Tyler Haskell's 85-year-old grandmother and 62-year-old mother suffering several stab wounds.

Haskell, 35, had left but officers found him a mile away. He was arrested without incident.

Police do not know the motive for the stabbing, but said that Haskell suffers from multiple mental illnesses.

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