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"Killer Within" signified the final appearance of IronE Singleton as a regular.

The episode marked Sarah Wayne Callies and IronE Singleton's final appearances as regular actors on the show.

At some events, local celebrities have made appearances, such as IronE Singleton, T-Dog from AMC's The Walking Dead.

Theodore "T-Dog" Douglas is a fictional character from the American television series The Walking Dead portrayed by IronE Singleton.

Meanwhile Rick, Shane and T-Dog (IronE Singleton) give gun training to Jimmy, Carl and the women on the farm.

"Killer Within" signified the final appearances of Sarah Wayne Callies (Lori) and IronE Singleton (T-Dog) as regulars.

Andrea (Laurie Holden) and Theodore "T-Dog" Douglas (IronE Singleton) realize that their plan is not working, and decide to flee instead of fight.

"Judge, Jury, Executioner" features recurring appearances from several actors and actresses including Lauren Cohan, Scott Wilson, Michael Zegen, and IronE Singleton.

Maggie directs Dale and Theodore "T-Dog" Douglas (IronE Singleton) to a nearby freshwater well, only to find a bloated zombie-commonly referred by the group as a "walker"-inside.

It features recurring appearances from Lauren Cohan, Scott Wilson, IronE Singleton, Emily Kinney, Jane McNeill, and James Allen McCune.

Leonard Pierce of The A.V. Club commented in his review of "Guts" that IronE Singleton was "wildly overacting" and that T-Dog "isn't much more than a clown".

He also signed Entourage (James "Slique" Adams, Floyd Massey, Eric Wade and Irone Guyton, a R&B singing group), rapper Ant-Dub and STRONG, an R&B group that was a family of five brothers.

In addition to the main cast, Melissa McBride reprised her role as Carol Peletier, IronE Singleton reprised his role as T-Dog, and Madison Lintz reprised her role as Sophia Peletier.

Ted Pigeon of Slant Magazine felt that the episode's "strong emotional undercurrents" were "a result of the sacrifice in both T-Dog's (IronE Singleton) final stand and Lori's decision to give birth despite the certainty that she won't survive the delivery".