UPDATE: Mitchell Guist Died of Natural Causes

Louisiana coroner John Fraiche has determined that Swamp People star Mitchell Guist died of natural causes, reports AP.

Final results will not be available for another four or five weeks.

Guist, 47, died after collapsing Monday while working on a houseboat he was building on Belle River, about 75 miles from New Orleans.

"He'd been building on a houseboat. He had just put it in the water this morning and was pushing it. That's when he went down," Guist's brother, Glenn, who co-stars on the show, told the Baton Rouge Advocate. "I still can't believe it," said Guist. "He was considered the baby of the family. I just can't believe it. He was as healthy as a horse."

The History Channel program, which airs at 8 p.m. on Thursdays, highlights Cajun culture and cooking and wildlife and fisheries in Louisiana, especially in the Atchafalaya Basin.