Cast and creators of AMC’s “The Walking Dead” gather for a celebration of their show at PaleyFest LA on March 17, 2017. Topics include: how the cast dealt with “the trauma” of beloved character Glenn Rhee’s (Steven Yeun) death; the secret behind Jeffrey Dean Morgan’s ability to make his character not only “exquisitely evil” but charismatic; and shooting the show in Atlanta’s 100-degree weather.