8. Carol's Suicide
Carol cannot go on living anymore. Tyreese has found someone else in Michonne. Rick Grimes won't love her because of his love for Lori. Sophia is getting closer to Carl. Carol needs someone because she is weak and dependent but there is no one. With nothing left for her, Carol allows her self to be eaten by a walker the group keeps locked up.
Why We Won't See It: Carol has Daryl in her life now. She also seems to be attached to baby Judith. Carol finally has someone she can be with in her life. We haven't seen any suicidal tendencies from her yet.
How We Could Still See It: It could be possible if Daryl and Judith are killed. Carol would have no reason to live. But I think she will perish in the prison fight.
7. Teen Suicide Pact
Tyreese's daughter Julie and her boyfriend Chris have decided they don't want this life anymore. After having sex, they attempt suicide but only Julie is successful. Tyreese goes into a blind rage and beats Chris to death. It was in this scene when they found out you reanimate after death.
Why We Won't See It: Tyreese, Julie, and Chris haven't been introduced and it doesn't seem likely they will. The show is only allowed one black person per season. Plus, teen suicide pacts probably won't sit well with AMC and Viewers.
How We Could Still See It: The three characters haven't appeared yet. It is possible it could happen. If the writers went through with it, the suicide scene would have to be extremely watered down.