ELKO, Nev. — The body of a Colorado man who went missing three years ago while riding an Amtrak train home has been found in Nevada, authorities said Sunday.

The remains of Robin Putnam were discovered last week and have since been positively identified, Elko County Undersheriff Clair Morris said. A railroad worker doing maintenance near the northeastern Nevada city of Wells found a skull, Morris said.

Deputies then located Putnam's body next to the tracks. His debit card was discovered nearby, the Elko Daily Free Press reported. Local authorities also sent out his DNA and dental records to assist with identification.

Morris did not say if there were any signs of foul play or a possible cause of death. The Elko County Sheriff's Office did not immediately return a message Sunday seeking comment.

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But on a Facebook page that was dedicated to finding Putnam, his family said the investigation is far from over.

"This story is not over yet," the family wrote in a Facebook post on Sunday. "We will get to the bottom of what happened to Robin!"

The 25-year-old artist disappeared after boarding a train for Colorado from art school in Emeryville, California, in July 2012. His belongings, including a laptop and journal, arrived in Grand Junction, Colorado.

An Amtrak employee reported seeing Putnam get off the train in Salt Lake City, police said. In the weeks that followed, his parents, who lived in Telluride, Colorado, combed Salt Lake City neighborhoods. The couple posted signs, interviewed people and then hired private investigators. The family said at the time that Putnam had an anxiety disorder.

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