Tallahatchie County Correctional Facility, run by CoreCivic. Photo by Alan Keays/VTDigger A second Vermont man this year has died in a Mississippi prison. Shawn Sears, 56, of Whiting, was found unresponsive in his cell Wednesday morning before medical staff attempted to give him emergency treatment, according to a press release from the Vermont Department of Corrections. “Mr. Sears was subsequently pronounced deceased,” the release said. Sear…