On this episode of The Walking Dead...
Tyreese gets angry about Karen’s death and demands Rick find her killer.
After Sasha gets sick, he decides to accompany Daryl, Michonne and Bob on a run for medicine to help the growing sick.
On their trip, Tyreese almost decides to stay and be killed by walkers, but he reunites with the group.
With the prison quarantined and the sick getting worse, including Glenn, Hershel decides not to sit back and instead help.
Rick figures out that Carol killed Karen and David.