A 20-year-old Kelso man was arrested Friday in connection with the death of Clark Calquhoun of Rainier.
The suspect was arrested on suspicion of first-degree murder and booked into the Thurston County jail.
The Olympian does not release the names of suspects until they have appeared in court.
Deputies began searching for 53-year-old Calquhoun on Dec. 31, after he went missing under suspicious circumstances, according to the Thurston County Sheriff’s Office.
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They searched near his home on 133rd Avenue Southeast in Rainier, but didn’t find Calquhoun.
They did, however, find evidence that led them to the suspect.
The County Sheriff’s Office recovered Calquhoun’s body from the Coweeman River on Jan. 28.
The Cowlitz County Coroner ruled the death a homicide.
The Thurston and Cowlitz County sheriff’s offices worked together to conduct interviews and gather evidence, according to the Thurston County Sheriff’s Office.
The suspect was arrested Friday night without incident.
Because the investigation is ongoing, the Thurston County Sheriff’s Office declined to release additional details about the case.
The suspect will likely appear Monday afternoon in Thurston County Superior Court.