CHICAGO — The man formerly known to investigators as Gacy victim No. 5 finally has a name thanks to advances in DNA testing and analysis. Genealogy information helped Cook County investigators identify a young North Carolina native as one of the unidentified victims of John Wayne Gacy. Francis Wayne Alexander disappeared between February 1976 and March 1977, according to authorities. On Monday, Cook County Sheriff Tom Dart released Alexander’s identity following a two-year investigation that, with the help of DNA experts, cleared a 43-year-old mystery that continues for five others slain by Ch...