Tyler Lewis told detectives he stabbed his mother Monday after getting into an argument with her, according to court papers. He also told detectives he stabbed his 67-year-old former neighbor "so that he would not be suffering anymore."
Lewis appeared in court Tuesday represented by a public attorney. A judge ordered him to undergo a mental health evaluation before he would be allowed to post bail.
Thurston County Coroner Gary Warnock on Tuesday identified the deceased woman as 59-year-old Frankie Austin.
A prosecutor identified the injured man in court as Charles Simpson. He is in critical condition Tuesday at a local hospital.
Police first became aware of the stabbings Monday afternoon when a motorist spotted a dog weaving in and out of traffic on Marvin Road SE. The driver followed the dog to a nearby home, and when she looked in the window she saw what appeared to be a seriously injured man.
That woman called 911 to report a man who looked like he'd been "beat up really bad."
"I'm scared out of my mind. For all I know we just walked into something really bad and there's still somebody in there. I don't know," the caller said.
While detectives were investigating the Lacey stabbing, 911 dispatchers received a phone call from Austin's husband, who told police he came home from work to find his wife stabbed to death in the garage.
The man told police that he believed Lewis was the attacker.
When asked why he believed Lewis was responsible, he said his stepson had long suffered from mental illness. Officials from the Thurston County Sheriff's Office say the stepfather had been concerned about Lewis' behavior and "somewhat in fear" of him.