Tyler Duckworth, a two-time champion of MTV's "The Challenge" and a cast member of "The Real World: Key West," was found dead at his home in Grand Forks, North Dakota, on Tuesday, according to NBC News and The Hollywood Reporter. He was 44.

Grand Forks police confirmed Duckworth's death following a welfare check at his residence but have not disclosed a cause of death, and representatives for Duckworth did not immediately respond to requests for comment, per NBC News. An autopsy result had not been made public as of Friday.

Duckworth, born March 5, 1981, in Atlanta and raised in Minneapolis, first appeared on reality television on "The Real World: Key West" in 2006. He went on to compete across six seasons of "The Challenge" — "The Duel," "The Gauntlet III," "Cutthroat," "Rivals," "All Stars 2" and "All Stars 3" — winning two of them, "Cutthroat" and "Rivals," making him one of the franchise's most successful competitors of his era.

Life After Reality TV

After stepping away from the show, Duckworth built a second career as a middle and high school teacher and was, at the time of his death, pursuing a doctorate degree, according to Deadline's reporting on his life outside the franchise.

"TYLER WAS A REMARKABLE MAN AND A GREAT FRIEND TO MANY. HE MADE FANTASTIC TELEVISION."

Tributes poured in from former castmates following the news. Fellow "Challenge" competitor Wes Bergmann wrote that "Tyler was a remarkable man and a great friend to many. He made fantastic television," a sentiment echoed across social media by other alumni of the show's mid-2000s and early-2010s seasons, several outlets reported Friday.

Duckworth's death adds to a string of losses among the reality-competition genre's earliest stars, many of whom are now in their 40s, two decades removed from their original seasons. No further details about funeral or memorial arrangements had been released as of Friday evening.