The singer was only 47 years old when he was found unresponsive due to heart failure at his home in Walterboro, South Carolina, the Colleton County Coroner's Office exclusively told Radar.
"He died just before nine o'clock last night," Coroner Richard Harvey told Radar. "And we are simply listing it as natural causes."
The coroner also told Radar that an autopsy would not be conducted at the family's request.
"Because of his medical history, the family asked that we leave it as natural causes," Harvey added.
Mack is best known for his classic hit "Flava in Ya Ear." The song earned him a Grammy Award in 1994 for Best Rap Solo Performance.
After finding fame, Mack left his life in music to become a minister in South Carolina.
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