Credit: Gene Page/AMC Photo: Carol Peletier Talks to Lizzie on The Walking Dead Season 4, Episode 3: “Isolation”

The Walking Dead Season 4, Episode 4: “Indifference” was loaded with backstory about some valuable members of Team Prison. We learned that Carol Peletier (Melissa McBride) really did stab Karen and David to death, both to put them out of their misery and to stop the flu from spreading, and we found out that newbie Bob Stookey (Larry Gilliard Jr.) turned to booze when he was alone (before Daryl found him) and now has a serious alcohol problem that’s alienated him from Daryl.

The dramatic highpoint of the episode though was when Rick Grimes (Andrew Lincoln) sent Carol packing, reasoning that he couldn’t allow her back in the prison because Tyreese (Chad Coleman) would kill her when he found out that she murdered Karen. He also wasn’t to keen about having killer Carol around his children.

While Episode 4 was largely away from the prison, Season 4, Episode 5: “Internment” will take us back. In the promo below we see the infected people getting worse (even dying?) including Glenn Rhee (Steven Yeun).

It also looks like another murder may have been committed, but we’ll let you take a look and decide that for yourself!

The Walking Dead airs Sunday nights at 9 p.m. ET on AMC.