In November 1997 in Flint, Michigan, police found the body of 45-year-old waitress Nancy Billiter. An autopsy revealed that she'd been bound, beaten, sexually violated, and then injected with a lethal mixture of battery acid and heroin. Police suspected Nancy's friend, Carol Giles, and her boyfriend Tim Collier. They soon discovered that the cold-blooded couple had killed Giles's diabetic husband with a heroin-laced insulin "hot shot", and that Nancy, who was in the wrong place at the wrong time, was the next to die. Here is the true story of two vicious killers who will now spend the rest of their lives behind bars.