Authorities say Travis Decker's daughters suffocated in plastic bags wrapped around their heads. DNA evidence suggests he acted alone.

( NewsNation) — DNA matching Travis Decker, the man suspected of killing his three daughters in Washington state, was the only DNA found at the scene of the girls’ deaths other than their own, officials in Washington state announced. The findings were made public in a press release issued by the Chelan County Sheriff’s Office on Tuesday.