Travis Decker, the father accused of murdering his three young daughters near a Washington campground, lacked mental health resources and struggled with post-traumatic stress disorder, his ex-wife's attorney told ABC News.

Paityn Decker, 9; Evelyn Decker, 8; and Olivia Decker, 5, were killed after they left home for a "planned visitation" with Decker at approximately 5 p.m. on May 30, officials said. At approximately 3 p.m. on Monday, officials located Decker's vehicle unoccupied near the Rock Island Campground in Chelan County, Washington, and the bodies of the three girls, but "Decker was not located," police said.

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