On October 27, 2013, AMC aired The Walking Dead season 4 episode “Isolation.” This episode begins with Tyreese (Chad L. Coleman) informing the others about the charred remains of two bodies he found. This leads to a brawl between Tyreese and Rick (Andrew Lincoln) and later a reveal of who was responsible for these deaths.
When Tyreese demands that Rick find the murderer of his girlfriend Karen (Melissa Ponzio) and David (Brandon Carroll), the second victim, his anger gets the better of him. He attacks Rick, who charges him and brutally beats him, while Daryl (Norman Reedus) tries to pull him off.
The prison was experiencing a flu that was spreading quickly, with Hershel (Scott Wilson) and Dr. S (Sunkrish Bala) doing their best to care for the infected who had been isolated from the others.
Rick investigates the blood trail the murderer left while dragging the bodies to the courtyard. He notices a bloody handprint on the door, which is much smaller than his own, indicating it could have been a woman.
The Walking Dead – Isolation
He would guess correctly that it was Carol (Melissa McBride) who took matters into her own hands to try and eliminate the spread of the flu by killing Karen and David. Was it the right choice? Perhaps not, but Carol is someone who will go to any lengths to protect her loved ones.
Carol puts her life in danger by attempting to fix a water intake house that is located outside the protection of the prison fence. Rick arrives in time to save her from a walker attack and then reminds her they were going to do the job together tomorrow. Her reply, “We don’t know if we’ll get a tomorrow.”
At the end of the episode, Rick confronts her in the courtyard, telling her going outside the fence alone was a stupid thing. She agrees. He asks her if there is anything she wouldn’t do for the group, and she responds, “No.” Next, he asks if she killed Karen and David, to which she replies, “Yes.”
Carol doesn’t always make the right decisions, but she is one of the only characters brave enough to make the hard choices and follow through.