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ran from sight as the helicopter passed, the sheriff's office said. Teams later found a trail, and K-9 teams tracked the person to the area of the Ingalls Creek Trailhead, south of Leavenworth.

Authorities did not say when they spotted the subject, but late Monday night they issued an alert for residents in the Ingalls Creek and the Valleyhi community to lock homes and vehicles and to be on the lookout for Decker.

Decker, 32, has been the target of a large manhunt ever since June 2, when a sheriff's deputy found his truck and the bodies of his three daughters — 9-year-old Paityn Decker, 8-year-old Evelyn Decker and 5-year-old Olivia Decker — at a campground outside Leavenworth.

He had failed to return the girls to their mother's home in Wenatchee, about 100 miles (160 kilometers) east of Seattle, following a scheduled visit three days earlier.

Decker was an infantryman in the U.S. Army from March 2013 to July 2021 and deployed to Afghanistan for four months in 2014. He has training in navigation, survival and other skills, authorities said. He once spent more than two months living in the backwoods off the grid.

Officials with an array of state and federal agencies have searched hundreds of square miles, much of it mountainous and remote, by land, water and air. The U.S. Marshals Service was offering a reward of up to $20,000 for information leading to his capture.

Last September, his ex-wife, Whitney Decker, wrote in a petition to modify their parenting plan that his mental health issues had worsened and that he had become increasingly unstable, often living out of his truck. She sought to restrict him from having overnight visits with their daughters until he found housing.

An autopsy on Friday determined the cause of death to be suffocation, the sheriff’s office said. The girls had been bound with zip ties and had plastic bags placed over their heads.