As the search for Travis Decker -- the dad accused of killing his three daughters -- has almost reached the three-month mark, officials are revealing disturbing new details about the crime scene and the evidence that they say indicates he is the sole suspect.

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.

“The completion of this DNA analysis provides additional evidence that indicates Travis Decker is the only suspect involved in committing these homicides,” the sheriff’s office said in a release. Decker's location is still unknown, and investigators have not confirmed whether he is alive or dead.