Mississippi authorities are on a manhunt for a suspect who fatally shot a sheriff's deputy after grabbing the cop's gun while he was taken into custody. The Hinds County Sheriff's Office said in a tweet that Joaquin Steven Blackwell, 22, of Magee, Mississippi, is 'armed and dangerous' after having fatally shot a Simpson County Deputy Friday afternoon in Mendenhall, Mississippi. The Jones County Sheriff's Department identified the deputy as being James Blair, 77, in a Facebook post Friday, noting he was 'Shot and killed in the line duty' and his end of watch date.