After five years of crisscrossing the country as a traveling medical technician, David Kwiatkowski landed at New Hampshire's Exeter Hospital in the spring of 2011. A full-time job in the hospital's cardiac unit soon followed.
It was at Exeter that federal prosecutors say the 33-year-old began to divert syringes of the drug Fentanyl. They say Kwiatkowski, who was arrested July 19, would inject himself with the painkiller, and then refill syringes with a saline solution. He is hepatitis C-positive, meaning those tainted needles might have spread the liver-damaging virus.
Best-selling crime novelist Karin Slaughter (yes, that's her real name) grew up just south of Atlanta in the 1970s and '80s, when the city saw some of its most gruesome crimes: A rash of child murders in which dozens of African-American children disappeared, their bodies turning up in nearby woods and rivers. The realization that horrid crimes can happen even to children changed Slaughter's life.