The suspect Alan Coulter, 54 accused of shooting and critically injuring a Sullivan County deputy last Friday has died, according to the Tennessee Bureau of Investigation (TBI). According to authorities, Coulter was found unresponsive in his jail cell just Monday evening, a release from the TBI states. Coulter was found in the corner of the cell, which housed three inmates. Attempts were made to resuscitate Coulter until paramedics arrived. The case is still being investigated.