Paul Kitterman was in the stands with his son, Jarod Tonneson, during the first half of the Denver Broncos game against the San Diego Chargers on Thursday night.
Jarod got up and left his 53-year-old father sitting alone in their Mile High bleacher seats at halftime — but hasn't seen his father since.
Friends and family are now searching for Kitterman — who was at the game with Jarod and two friends — and claim he never returned to his seat for the rest of the game and has since vanished without a trace.
Tia Bakke and her boyfriend had invited Paul and Jarod to see what would be their first Broncos game.
"Paul and Jarod had never been to a game so we got some extra tickets," said Bakke, who drove down to Denver with the two from Kremmling, about two hours away.
The father and son were seated in bleachers away from Bakke, but met up during the halftime intermission. When they separated again, Paul told Bakke he'd see her after the game, reported 9 News.
That was the last anyone has seen of him. His son Jarod was in the restroom during halftime and said that he returned to his seat but that his father never did.
Paul's friends and his son searched Mile High stadium after the game, speaking to staff and police, and phoned the area jails and hospitals without getting any clues as to what happened to Paul.
According to Bakke, Paul is "not a technology guy" and was carrying only $50 in cash, without any credit cards or cellphone.
Though a missing persons report was filed and family and friends have handed out flyers and continuously called hospitals, so far there has been no trace of Paul.
UPDATE: Man found unharmed.