Cooper was 15 when she and three other teenage girls showed up at Ruth Pelke’s house on May 14, 1985, with plans of robbing the 78-year-old Bible school teacher. Pelke let Cooper and two of the teen’s companions into her Gary home after they told her they were interested in Bible lessons.
As the fourth teen waited outside as a lookout, Cooper stabbed Pelke 33 times with a butcher knife. Then she and the other girls ransacked the house. The four girls fled with Pelke’s car and $10.
Cooper’s three accomplices were sentenced to prison terms ranging from 25 to 60 years. But Cooper, who confessed to Pelke’s slaying, was convicted of murder and sentenced to die in the electric chair. At the time — in 1986 — she was the youngest death row inmate in the U.S.