WHO KILLED MARTHA ANN DICKS?

According to https://www.websleuths.com/forums/threads/sc-martha-ann-dicks-19-sumter-29-mar-1972.372037/ and https://www.websleuths.com/forums/threads/sc- martha-ann-dicks-19-sumter-29-mar-1972.372037/ , Martha Ann Dicks disappeared on March 29, 1972 from Manning Avenue in Sumter, South Carolina. The fact is linked to the crimes of Sumter County in Florida, with victims Shirley Elizabeth Whitten and Roger Dale Higgins and to Sumter Avenue in Fort Lauderdale, the Venice of Florida where