ST. HELENS, Ore. -- A St. Helens man pleaded not guilty to murder charges in the death of a mental health worker who came to his home to help him earlier this month.

After Tuesday's hearing, KGWobtained court documents that described evidence in the murder case.

Jennifer Warren, who worked at Columbia Community Mental Health, was stabbed to death in Brent Redd's home at SE 15th Street and Cowlitz Street, according to St Helens Police Chief Steve Salle.

The affidavit of probable cause said that Redd phoned 9-1-1 and said he had stabbed his med provider and that she was dead.

When police arrived, Redd met them at the door, covered in blood, according to the court documents. Warren's body was in the kitchen near a sliding glass door. She had been stabbed numerous times.

A knife consistent with the wounds and with some blood on it was found on a couch cushion, the affidavit said.

Redd was taken to Legacy Emanuel Hospital, in Portland, where he was treated for minor injuries and then jailed. During Tuesday's hearing, the judge ordered Redd held without bail at the Oregon State Mental Hospital.

Our thoughts and prayers are out there to Jennifer's family, said Debbie Redd, Brent's mother. We are so sorry for what happened.

It just broke my heart, added Doris Stanger, Brent's grandmother. I can't believe he would do something like that.

The murder left many asking why Warren was put in such a vulnerable position and an independent investigation has been launched over employee safety.

Any time a service provider is in someone s residence, like the police do on a regular basis, there s always a possibility something bad will happen, Salle said.

I think it s always tragic when a human life is taken, neighbor Patrick Birkle told KGW. I think it s especially tragic when it s someone whose goal is to help.

In 2007, Redd pleaded guilty except for insanity for attempting to murder a family member. He was sent to the state mental hospital. Then, in 2010, the Psychiatric Security Review Board granted him a conditional release back into the community.

The question Oregonian should be asking is 'why hasn't he kept at the state hospital? said Steve Doell with Crime Victim's United.

In a statement, the state board said This incident is the first time in 34 years when any client under the board's jurisdiction has been alleged to have committed a violent act of this nature.

Fellow social workers said they wondered what information, if any, was provided to Warren about her patient's past before she entered his home alone.

Friends and fellow workers told KGW they want to know if there is any way this tragedy could have been prevented.

She was a very genuine person. She took care of everybody, said friend Curt Williams.

(KGWReporters Kyle Iboshi and Tim Gordon contributed to this report)

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