The U.S. Marshals Service has declared Travis Decker , the 32-year-old father accused of allegedly killing his three daughters this summer, to be dead, according to a court filing obtained by ABC News. "The United States Marshals Service has advised the Defendant TRAVIS CALEB DECKER is deceased," according to the document, which was filed to dismiss the case and quash the arrest warrant for Decker. Decker, an Army veteran, was previously wanted for three counts of first-degree murder and three counts of first-degree kidnapping. His daughters -- Paityn Decker, 9; Evelyn Decker, 8; and Olivia Decker, 5 -- had left home for a planned visitation with him on May 30, and never returned, officials said. Three days later, the girls were found dead near the Rock Island Campground in Chelan County,

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