S13·E15 Episode #517

Boston Strangler - Recently unearthed DNA evidence suggests Albert DeSalvo, the man thought to be the ""Boston Strangler,"" was not the killer of 19-year-old Mary Sullivan, the woman believed to be the eleventh victim. This new development raises doubts about whether Albert DeSalvo actually killed any of the women he confessed to strangling in the 1960s. If Albert DeSalvo isn't the ""Boston Strangler,"" then is the real Strangler still at large? Mary Sullivan/Boston Strangler (Unexplained Death)