As the manhunt for the survivalist father accused of killing his three daughters before disappearing into the Washington wilderness sails past the one-month mark, local authorities are expressing their frustration as the trail begins to run dry. 

“I’m still angry,” Chelan County Sheriff’s Deputy Mike McLeod told USA Today as he recounted the search for 33-year-old Travis Decker. “He still hasn’t been found.” 

Decker, a former member of the U.S. Army and trained survivalist, is wanted for allegedly killing his three children – Paityn; 9, Olivia, 5; and Evelyn, 8. The girls were reported missing by their mother, Whitney Decker, on May 30 after they did not return home from a court-mandated custody visit with their father.

The U.S. Marshals Service remains the lead agency in the four-week-long hunt, working alongside SWAT teams and local law enforcement. 

“You have to be responsible with your financial resources,” Morrison said. “Which means you have to ask whether you are tracking active leads. Typically, people who disappear want to live in more populated areas where they have access to supplies.”

At the time of the girls’ deaths, Decker was homeless, living between motels and campground sites while suffering from mental health issues, according to court documents. He is charged with three counts of aggravated first-degree murder and kidnapping. 

The Chelan County Sheriff’s Office did not immediately respond to Fox News Digital’s request for comment. 

Decker is described as a white man standing 5 feet, 8 inches tall, and weighing approximately 190 pounds. Authorities warn that he is considered armed and dangerous but insist they have no reason to believe Decker is a threat to public safety.

The U.S. Marshals Service is offering a $20,000 reward for any information leading to Decker’s arrest.