After agonizing for hours about the condition of Abbeville County sheriff’s Sgt. Danny Wilson, hostage negotiators using a robot finally learned his fate. A video camera mounted in the robot showed the 36-year-old deputy lying in a pool of his own blood — with his hands cuffed behind his back — about 10 feet inside the home of Rita and Arthur Bixby. His death was a bitter blow to State Law Enforcement Division Chief Robert Stewart, whose SWAT agents had tried desperately all day to win the officer’s release, hoping he was still alive. They later would learn that Wilson...