MORGANTOWN, W.Va. (AP) — A former superintendent at the West Virginia coal mine where 29 men died in 2010 is now behind bars at a minimum-security federal prison in Morgantown, U.S. Bureau of Prison records showed Tuesday. Gary May was sentenced in January to 21 months in prison on a conspiracy charge for his actions at the former Massey Energy Co.'s Upper Big Branch Mine. May, 44, of Bloomingrose pleaded guilty last year to charges that he defrauded the federal government with actions that included disabling a methane gas monitor and falsifying records. May has cooperated with prosecutors in their continuing criminal investigation of the worst U.S.