How did famed moonshiner "popcorn sutton" die ?

Famed moonshiner Marvin "Popcorn" Sutton (born October 5, 1946 in Maggie Valley, North Carolina) committed suicide by carbon monoxide poisoning on March 16, 2009, most likely to avoid a federal prison term due to begin a few days later. Sutton was sentenced to 18 months in federal prison in January of that year for illegally distilling spirits, and for possession of a firearm as a felon. A lot of people have been seeing old clips of Sutton recently on the Discovery Channel reality show Moonshiners.