In the most detailed study ever of fatalities and litigation involving police use of stun guns, Reuters finds more than 150 autopsy reports citing Tasers as a cause or contributor to deaths. Many who die are among society's vulnerable - unarmed, in psychological distress and seeking help. As her husband stalked around the back yard, upending chairs and screaming about demons, Nancy Schrock ... dialed the police. He needs to be in the hospital," she told a 911 dispatcher. Tom Schrock had struggled with depression ... throughout their 35-year marriage. Police had visited the family's [house] more than a dozen times. Typically, Tom was taken to the hospital, medicated and sent home after 72 hours. Not this time. Three officers answered the call, categorized by the dispatcher as a disturbance involving an unarmed man with mental health issues. Nancy took them through the house to the back; Santiago Mota, a veteran cop, drew his Taser. As officers came out the back door, Tom strode toward them. Mota fired the Taser. Tom buckled, then retreated. Mota followed, pressed the electric stun gun to Tom's chest and fired again. The 57-year-old collapsed [and] never regained consciousness. "I called for help," Nancy said. "I didn't call for them to come and kill him." Reuters documented 1,005 incidents in the United States in which people died after police stunned them with Tasers. In nine of every 10 incidents, the deceased was unarmed. More than 100 of the fatal encounters began with a 911 call for help during a medical emergency.