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ST. HELENS, Ore. -- A man accused of killing a mental health worker in St. Helens last year has pleaded guilty except for insanity.

Brent Redd made his plea Tuesday morning in the May 2012 stabbing of Jennifer Warren. She was killed while making a medicine delivery to his apartment in St. Helens.

Background: Mental health worker fatally stabbed in St. Helens

After Redd's plea, Warren's mother Theresa Armstrong made an emotional statement in court.

For me there is such a hole in my heart, she will never see her first grandchild. Her life was taken by one selfish act that will cost many people, she said.

One of Redd's attorneys said his client has shown remorse for what happened but that he was unable to speak in court.

Redd will likely spend the rest of his life in a mental hospital.

More: Affidavit reveals details of St. Helens murder

He also pleaded guilty except for insanity in 2007 when he was accused of trying to kill his mother. He was released in 2010.

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