Local news provider KFVS reported that Scott County Coroner Scott Amick said a "health condition" had been responsible for Neal's death, while TMZ notes that he had an existing condition "related to his heart".
Boyd suffered from a number of medical issues, including heart, kidney and liver problems.
TMZ reports that no autopsy will be conducted in Boyd's death.
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Last year Neal and his mother Esther were involved in a near-fatal auto crash when the vehicle he was driving hit two trees.
The former insurance salesman-turned-opera singer won the 2008 competition, and the $1 million prize, after sharing with audiences - and judges David Hasselhoff, Piers Morgan and Sharon Osbourne (Jerry Springer was host) - the story of his impoverished upbringing, and love of singing. It's a very slow progress. "It's been hard, because you can't get up on stage right now, you can't perform for the audiences and you can't really do too much recording or traveling".
The opera singer also ran unsuccessfully as a Republican for a southeast Missouri House of Representatives seat. Earlier this year, he revealed that he was working on a new album slated for release in 2019.
The Missouri native noted that "it just feels like something great is about to happen once I get back on my feet and back in front of the audience again". Just be grateful that you survived.