From Wikipedia:
"The Oklahoma Girl Scout Murders is an unresolved crime in rural Mayes County, Oklahoma. On a rainy, late-spring night in 1977, three girls—ages 8, 9, and 10—were raped and murdered and their bodies left in the woods near their tent at summer camp. Although the case was classified as "solved" when Gene Leroy Hart, a local jail escapee with a history of violence was arrested, and stood trial for the crime, he was acquitted. Thirty years later authorities conducted new DNA testing, but the results of these proved inconclusive, as the samples were too old."
