PIERRE PART, La. (AP) - A Louisiana sheriff says a cast member of the reality TV show "Swamp People" has died.

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Assumption Parish Sheriff Mike Waguespack says Mitchell Guist (GIHST) was pronounced dead at a hospital Monday. He had fallen while aboard his boat on the Intracoastal Waterway, near Pierre Part.

According to CNN, Guist may have had a seizure while on the boat.

Waguespack says initial reports from deputies in neighboring St. Martin Parish are that Guist was traveling on the waterway around 9 a.m. when he fell. The boat returned to a nearby landing in St. Martin and Guist was taken to a hospital. The cause of his fall is unclear, and there is no word yet on the official cause of death.

"Swamp People," on the History cable television channel, features residents of Louisiana's Atchafalaya swamp country during alligator hunting season.

According to a statement on the show's website, Guist "passed on the swamp, doing what he loved." He was often seen on the show with his brother, Glenn.

Pierre Part is about 83 miles west of New Orleans. The show follows Guist and other Louisiana swampers during the 30-day alligator hunting season, a critical part of the year in the region.