Defense attorneys claim Andrew Brannan was suffering from post-traumatic stress and bipolar disorder . The defense says the former Marine suffered a traumatic brain injury in Iraq that left him unable to distinguish reality from fantasy. Andrew Brannan , 66 , who is scheduled to be put to death this week for the murder of a 22-year-old Georgia sheriff 's deputy in 1998 , is hoping his sentence will be found uniquely unconstitutional . He killed Deputy Kyle Dinkheller , 22 , in 1998 ; YouTube videos show the deadly confrontation .
Defense attorneys claim Andrew Brannan was suffering from post-traumatic stress and bipolar disorder . The defense says the former Marine suffered a traumatic brain injury in Iraq that left him unable to distinguish reality from fantasy. He killed Deputy Kyle Dinkheller , 22 , in 1998 ; YouTube videos show the deadly confrontation .