DNA analysis has confirmed that the former Army soldier suspected of murdering his three daughters and disappearing into the Pacific Northwest wilderness is the only suspect in the gruesome crime.

The Chelan County Sheriff’s Office released new details about the crime scene where Paityn, Evelyn, and Olivia Decker (ages 9, 8, and 5) were found dead. All three girls had plastic bags over their heads — two of the girls had two bags over their heads and the third had three bags. DNA collected from the bags belonged to their father, Travis Decker, or to the girls themselves.

One DNA profile was found on cable ties located in the area, and that sample also belonged to Travis Decker.

“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.

Previously, autopsies had determined the girls were suffocated by their killer.

The girls’ mother reported them missing on May 29 when Decker failed to bring them home after a planned visit. Police did not issue an Amber alert despite concerns about Decker’s behavior prior to his absconding with the children, and then the girls were found dead on June 2 near Decker’s truck, parked in a campground. Decker was nowhere to be found.

Investigators have been searching for him for months, but his “whereabouts remain unknown,” the sheriff’s office said. Investigators “do not have any evidcene to suggest Travis Decker is either alive or deceased,” the department said.

The US Marshals Service is offering a reward of up to $20,000 for information leading to Decker’s arrest. Police said he should be considered armed and dangerous.