Updated

ST. JOHN, Ariz. -- A forest ranger is being hailed as a "true hero" for alertly spotting a pair of fugitives and allowing a heavily armed law enforcement contingent to arrest them.

John McCluskey and Casslyn Welch were captured at an Arizona campsite after a three-week manhunt.

The fugitives' ruse began to crumble about 4 p.m. Thursday when a U.S. Forest Service ranger investigated what appeared to be an unattended campfire. He approached the couple and later notified authorities, who swarmed the campsite about three hours later.

Apache County Sheriff Joseph Dedman said Friday that the ranger is "a true hero. He was out there doing his job."

It's not clear where the fugitives traveled while on the run. They are suspected in several crimes, including the killing of a couple in New Mexico.