Disturbing New Details Revealed About Killings of Travis Decker's Daughters, as Police Give Update on Search By Nicole Acosta 13

New details have been released in the case of Travis Decker, the Washington state fugitive accused by authorities of killing his three daughters.

Decker, a 32-year-old U.S. Army veteran, disappeared on May 30 during a court-approved visit with his daughters, Paityn, 9, Evelyn, 8, and Olivia, 5. When he failed to return them to their mother, Whitney Decker, at the scheduled 8 p.m. drop-off in Wenatchee, Wash., concern quickly grew.

Whitney reported the girls missing around 9:30 p.m., launching a frantic three-day search that ended in horror: the girls were found dead near Travis’ abandoned pickup truck at the remote Rock Island Campground in Chelan County on June 2. Meanwhile, the father was nowhere to be found.

Travis is wanted on first-degree murder and kidnapping charges and has yet to be apprehended nearly three months after the search for him began.

Each girl was found with plastic bags over her head and at least one was restrained with zip ties, per an affidavit previously obtained by PEOPLE. In an updated press release shared on Tuesday, Aug. 19, the Chelan County Sheriff’s Office provided additional details about the condition in which the sisters were found.

“Two of the victims each had two separate bags over their heads and the third victim had three separate bags over their head,” the release states. “In addition, several cable ties were located on the ground in the immediate area of the bodies.”

A medical examiner previously determined the three sisters each died of asphyxiation and their manner of death was ruled a homicide.

The Chelan County Sheriff’s Office reiterated Tuesday that Travis remains the sole suspect in the killings, citing DNA evidence allegedly linking him to all of the plastic bags covering his daughters’ heads and one of the zip ties collected at the scene.

“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.

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Investigators previously said the Washington State Crime Lab confirmed that the DNA in the blood found on the tailgate of Travis’ truck matched the DNA profile they believe is his.

Travis has been the subject of an intense manhunt. Authorities have said the military veteran is well versed in wilderness survival. They also believed he may have fled to Canada after he allegedly searched “how to relocate to Canada” online, according to a U.S. Marshals Service affidavit obtained by PEOPLE.

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There have since been two debunked sightings of Decker: one on June 10 near Highway 97 in Washington State and another as recently as July 5 in the Bear Creek area of the Sawtooth National Forest in Idaho. However, officials later said neither were confirmed to be him.

“At this time, we do not have any evidence to suggest Travis Decker is either alive or deceased,” the sheriff’s office said in the release.

A $20,000 reward has been offered by the U.S. Marshals Service for information leading to his arrest.