In the wrap-up of our Black Dahlia Serial Killers series, host Tracy Pattin interviewed true crime experts Joan Renner, editor of Deranged LA Crimes.com and author of The First with the Latest: Aggie Underwood, the Los Angeles Herald, and the Sordid Crimes of the City, and Jim Clemente, host of Wondery's Real Crime Profile, as well its Best Case/Worst Case and Locked Up Abroad podcasts. He's also a writer/producer for Criminal Minds on CBS and creator of Discovery's Manhunt: Unabomber. Tracy interviewed Joan and Jim earlier, in episodes 13 to 17, about the murders covered in the first season, including that of Elizabeth Short, the Black Dahlia. Now she follows up with them on the murders we covered in the second round - and gets these experts' take on the big question: Were all these crimes committed by a single killer or were they the work of multiple copycats and lone wolves?