Stepsister: Accused gunman has had ‘demons’ for years

DENVER — The stepsister of a man charged with fatally shooting three people at a Colorado Walmart said he has been tormented by voices in his head since taking LSD nearly 30 years ago.

“When he came home, he was terrified. He had voices in his head. Demons,” Michelle Willoughby told The Denver Post in an interview posted online Monday.

Prosecutors filed multiple counts of first-degree murder and attempted-murder charges Monday against Scott Ostrem, 47.

Ostrem is accused of walking into a Walmart in the Denver suburb of Thornton on Wednesday and fatally shooting a woman and two men. Prosecutors still have not offered any clues into possible reasons for the attack.

Willoughby, who lives in Cocoa Beach, Florida, said she does not know what might have triggered the shooting because she has not been able to speak with Ostrem.

But she said he had been outgoing, sociable and athletic before taking LSD at a party in 1988, and afterward he became a recluse haunted by voices saying the devil was after him.

The family contacted a hospital, and Ostrem underwent a drug intervention but did not get psychological treatment, she said.

Charles Grob, a psychiatry professor at UCLA, said it is unlikely that LSD would be the cause of a decadeslong psychosis. It was more likely that Ostrem had “some severe disturbance to begin with,” he said.

“I don’t think LSD is the right culprit,” Grob said.

Willoughby said she is bothered by the way Ostrem has been characterized on social media.

“My brother is not this monster,” she said. “He is not cold-blooded. He hears these voices. Honestly, in my heart, I believe there is only so much a person can take.”

Ostrem did not enter a plea Monday. He is being held without bail.

The murder charges carry a sentence of life without parole or the death penalty. Young has not said whether he will seek the death penalty.

The attempted-murder charges carry a sentence of eight to 48 years.

The judge scheduled a Feb. 5 preliminary hearing for prosecutors to lay out their case.