Coleman and Green joined the show during Season 3 as fan-favorite comic book character Tyreese and his sister Sasha, respectively, but were quickly turned away from the survivors in the prison when Rick (Andrew Lincoln) was losing of sanity. In the finale, the duo assisted the group in finding Andrea (Laurie Holden), who died shortly after.
Kinney, who plays Hershel's (Scott Wilson) youngest daughter Beth, has been with the series since Season 2 when Rick's group came across the farm. The character, who's known to sing a tune to pass the time, showed a more vicious side during the season finale when she made her first real zombie kill that the audience has seen.
Additionally, Melissa Ponzio, who portrays Woodbury survivor Karen, will be a recurring guest star in Season 4. As previously announced, David Morrisey, who plays the evil and sadistic Governor, will also return as a series regular.
It comes as no surprise that the series, which hit record ratings with an all-time high of 12.4 million viewers and 8.1 million in the adults 18-to-49 demographic during Sunday's Season 3 finale, is bumping up these characters, which will help replacing the void left by five characters — Lori (Sarah Wayne Callies), T-Dog (IronE Singleton), Milton (Dallas Roberts), Merle (Michael Rooker) and Andrea — who were killed off over the course of Season 3.
The Walking Dead returns for Season 4 in October.