(NewsNation) — Police may have spotted ex-soldier Travis Decker, who is accused of killing his three young daughters. He may be hiking alone off-trail near Colchuck Lake in Washington State, the Chelan County Sheriff's Office said Tuesday.

The Sheriff's Department says a tip came in from hikers who spotted a lone hiker who seemed to be very ill prepared for the trail. Authorities also said he was seen running from a helicopter.

Decker's three daughters were found dead near his vehicle at a campground site. Their cause of death was suffocation.

“It sounds to me like his capture is imminent," Chris Swecker, former assistant director of the FBI, told "Banfield" on Tuesday. Swecker worked the manhunt for Olympic Park bomber Eric Rudolph.

The forest where police are searching for Decker is

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