(NewsNation) — The U.S. Marshals Service has declared Travis Decker dead after a months-long search.

Decker's death was revealed in a motion to dismiss his arrest warrant in the U.S. District Court in Washington. He had been accused of killing his three daughters Paityn, 9; Evelyn, 8; and Olivia Decker, 5 after they were found dead in June.

Last week, investigators said they were working to formally identify remains they believed were Decker's.

Decker had been reported missing since May 30 when authorities said he never returned the girls to their mother after a parental visit. The search included U.S. Marshal’s Special Operations Group, along with the U.S. Border Patrol’s Tactical Unit as well as local sheriff’s deputies.

In court documents, Decker said he had previously lost overnigh

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