As authorities continue their search for Travis Decker, the Washington state man accused of suffocating his three daughters to death, investigators now believe he is the only suspect in the crime based on evidence found at the gruesome scene.

DNA testing has confirmed Travis Decker, a Washington state father accused of killing his three daughters in June, is the sole suspect in the murders, authorities said Tuesday.

The Chelan County Sheriff’s Office says new DNA evidence directly links Travis Decker to the deaths of his three daughters, whose bodies were found in June near Icicle Creek. On June 2, deputies discovered the bodies of Paityn, Evelyn and Olivia Decker close to the Rock Island Campground.