OLYMPIA, Wash. -

The second victim in stabbings Monday in Lacey has died, and prosecutors have filed two counts of first-degree murder against 30-year-old Tyler Lewis.

The Lacey man is accused of stabbing his 59-year-old mother to death Monday in the garage of her home. Frankie Austin was killed with a screwdriver.

Lewis also is accused of using a screwdriver to fatally stab a former neighbor, 67-year-old Charles "Wes" Simpson at his home. He died Thursday in a hospital.

The Olympian reports Thurston County Deputy Prosecutor Andrew Toynbee filed the murder charges Thursday.

Lewis is held on $2 million bail in the Thurston County Jail, waiting for a mental evaluation. He's also charged with robbery in the theft of his mother's ring and animal cruelty in the death of his mother's dog.