Sumter County Sheriff Anthony Dennis said a pathologist confirmed Friday that the bones found by a man collecting cans two days before were Aaron Abraham.
Authorities say Abraham was last seen on security camera footage leaving the Sumter County Library on July 19 as it closed. He appeared to be alone.
Abraham's body was found Wednesday in a ditch off state Highway 261 near Wedgefield.
Investigators say they don't have and suspects or a motive for the killing.