Duane Ollinger, the rugged Texas oilman who turned a mysterious Utah property into one of reality TV’s strangest treasure hunts, has died. He was 68.

The Discovery Channel star, best known for Mystery at Blind Frog Ranch, died Tuesday at a Texas hospital after battling ALS, a family source told TMZ.

Ollinger became a fan favorite on the hit series, which followed him and his son, Chad Ollinger, as they searched for what they believed could be a legendary stash of lost Aztec gold buried beneath Blind Frog Ranch in Utah.

The show first premiered in 2021 and quickly pulled viewers into a world of underground caves, eerie local legends, strange discoveries, and whispered stories of a curse surrounding the land.

At the center of it all was Duane.

He was not just the owner of the ranch. He was the driving force behind the hunt.

The former Texas oilman poured years of his life, money, and energy into the belief that something massive was hidden beneath the rugged property. Fans watched as he pushed through danger, setbacks, and skepticism while chasing answers below the surface.

Blind Frog Ranch became famous for its strange cave system and the many theories surrounding it. Some believed treasure was buried there. Others pointed to darker legends tied to the land.

Duane never seemed shaken by the mystery.

He kept digging.

But his health battle eventually forced changes behind the scenes. At the start of the show’s sixth season, which premiered last week, leadership shifted to Josh Feldman after Duane became ill.

The news of his death comes as longtime viewers were just returning to the ranch for another season of mystery, danger, and unanswered questions.

For fans, Ollinger was more than a reality TV personality. He was a determined dreamer who believed in the impossible and chased it with everything he had.

His death marks a sad turn for a series built around buried secrets, family determination, and one man’s refusal to give up on the mystery beneath his land.

Duane Ollinger was 68.