Homicide suspect identified through DNA in 1990 Snohomish County cold case

Genetic genealogy led the sheriff’s office to identify Robert Brooks, who died in 2016, as the suspect in the killing of 17-year-old Michelle Koski in 1990.

SNOHOMISH COUNTY, Wash. — A suspect in the killing of 17-year-old Michelle Koski in 1990 was identified through the use of forensic genealogy, according to the Snohomish County Sheriff’s Office.

Snohomish County Sheriff’s Cold Case Detective David Heitzman said Parabon NanoLabs used genetic genealogy to help identify Robert A. Brooks, who died in 2016, as the suspect in the sexual assault and murder of Koski.

Koski’s body was found on August 25, 1990, by a woman walking her

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