The brother of Montgomery Gentry's Troy Gentry has died.  The country star hasn't revealed any details regarding the situation, but through "Team MG" is expressing his gratitude for the support he's received from fans.  In his Facebook message he says he'd like to thank everyone for their outpouring of thoughts and prayers.  Troy adds that he appreciates fans' "kindness and respect" as he and his family "grieve the loss" of his brother Keith.