The families of women killed by a man the FBI has described as America's most prolific serial killer say their cases went unnoticed for years. "It just tears me up," one relative said.

When Martha Cunningham was found dead near Knoxville, Tennessee, in January 1975, her body was bruised, her clothes had been pulled off and she was missing her purse.

Not long after, the police closed the case. A medical examiner's report listed the cause of Cunningham's death as unknown, according to David Davenport, a retired investigator for the Knox County Sheriff's Office who later reopened the case.

Nearly

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