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Murdered woman was scared by son's behaviors, December report says

Deputies responded to the same home in December for a mental health call, and the victim expressed concerns that her son might hurt himself or her.

JEFFERSON COUNTY, Colo. — About six weeks before he was arrested in connection with his mother's death, a Jefferson County man summoned deputies to his home because he said he was being assaulted by a woman pretending to be his mother, a report from the Jefferson County Sheriff's Office (JCSO) says.

Michael Osse, 55, was arrested on charges of second-degree murder related to the death of his 85-year-old mother Marie Osse.

JCSO deputies said around 8:35 a.m. on Jan. 24, they responded to a home on West 32nd Avenue near the intersection with Eldridge Street, which is east of Golden. 

Marie Osse was found dead in the home, and it's believed she died from blunt force injuries, according to JCSO. Her other son had discovered her body and spoke with deputies at the home, an affidavit says. He reported that Michael Osse lived with their mother at the home and said that Michael Osse had schizophrenia, the affidavit says.

Credit: JCSO
Michael Osse

A deputy researched Michael Osse and found that on Dec. 8, he had summoned deputies to his home. According to that report, Michael Osse said a woman was pretending to be his mother and said the woman was "knocking him out at night" and assaulting him.

The document says Michael Osse was convinced his mother was assaulting him while he sleeps, but he didn't have any injuries, the document says.

He was adamant the woman he was living with stole his mother's identity and was "not his real mother," the report says. 

A deputy spoke with Michael Osse's mother at the home, and she said it was "not uncommon" for him to "go through periods like this," the report says. She explained that he was in an accident of some type about 11 years ago and had been in a coma. After that, she said her son was never the same, the report says.

She reported that when Michael Osse has these episodes they can last several days or weeks, and she's supposed to contact her two other children to let them know, but said she "doesn't like to make a fuss," the report says.

She reported that it "scares her" when he gets like that and said she "doesn't know if he will hurt himself or her," according to the December report. The deputy stressed to Marie Osse that she should contact her other children and told her that if she ever felt scared she should call the police, the report says. The deputy also left a card with the non-emergency line on it.

Marie Osse reported that she did not know if her son had been diagnosed with any mental illnesses.

Hours before Marie Osse's body was discovered on Jan. 24, Colorado Springs police made contact with Michael Osse, an arrest affidavit says. When officers there contacted him around 1:00 that morning, he "did not know where he was or how he got there," the affidavit says. It also says Michael Osse appeared to be in a state of "mental breakdown," and he was taken to a hospital on a mental health hold.

While at the hospital, Michael Osse began making comments about having killed someone, the affidavit says. Technicians at the hospital began recording their interactions with him, and provided them to detectives, according to the document.

On the recordings, he can be heard saying "I killed her" three times, the document says.

Jefferson County deputies picked him up Monday afternoon, and he was jailed on charges of second-degree murder, the sheriff's office said.

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