Walking Dead TV Academy It was an almost Walking Dead full house tonight on stage at the TV Academy’s Leonard E. Goldenson Theatre. Almost. Noticeably absent Tuesday was Glen Mazzara. The departing executive producer and showrunner, who AMC announced was exiting from the hit show in December, was supposed to be there with creator/executive producer Robert Kirkman, EP Gale Anne Hurd and the Dead‘s main cast. His name was included along with everyone else’s when the invite went out last month. However, Mazzara’s name and presence suddenly disappeared from the event without explanation late last week. No details were given on stage about his absence; the only questions asked of the panel came pre-selected from social media. No questions were taken tonight live from the audience. However, a source close to the event told Deadline that Mazzara was “unavailable.” He was so unavailable that he was on Twitter throughout the day Tuesday talking about The Walking Dead. In mid-January, Walking Dead supervising producer Scott Gimple was named as Mazzara’s replacement.

Related: NATPE: Glen Mazzara Says “Ask AMC” Why He Was Dropped From ‘Walking Dead’

The Walking Dead returns for part two of its record-breaking third season on February 10. The show was renewed for a fourth season late last year.