The Snohomish County Medical Examiner determined Monday that 53-year-old Cheryl DeBoer died of asphyxiation and freshwater drowning.
According to the medical examiner’s report, the Mountlake Terrace woman suffocated by a plastic bag over her head. Freshwater drowning was also listed as a cause of death.
The manner of death is listed as “undetermined.”
“At this point in the investigation, there is nothing to suggest DeBoer’s death was the result of an act of homicidal violence,” Mountlake Terrace Police Chief Greg Wilson said in a press release.
Investigators with Mountlake Terrace Police are continuing their investigation into this case. For now, they are waiting for the examination of DeBoer’s computers, cell phone records and other collected items of evidence. That information may assist investigators in determining the manner of death.
“We don’t want to say what it is yet, as we are still investigating, but there is no evidence of homicidal violence,” Mountlake Terrace Deputy Police Chief Pete Caw said. “We don’t know what it is yet.”
DeBoer’s body was found in a culvert near Cedar Way and 244th Street Southwest five weeks ago. She had been missing for nearly a week before that. She was last heard from on Monday, Feb. 8 on her way to work, but she never arrived at the office or back home.
Blood was found inside DeBoer’s car, on the passenger seat and inside the front passenger door. The medical examiner also found small cuts on two of DeBoer’s fingers, but said those cuts appear to be self-inflicted.