Fox News True Crime Newsletter: Zodiac Killer's victim, Gilgo Beach killer's ex-wife, Nancy Guthrie's DNA

The article highlights updates on several true crime cases, including potential links between the Zodiac Killer and the Black Dahlia case, Rex Heuermann's ex-wife living in the basement where he murdered victims, and DNA testing progress in the Nancy Guthrie case. It also mentions cold case breakthroughs using forensic genealogy and new evidence in the Idaho murders.