Judith Grimes, portrayed by Cailey Fleming, is a character in the television series The Walking Dead.
Judith is Lori's daughter and Carl's half-sister who was born in the third season episode "Killer Within". Maggie Greene delivers her via a crude C-section, using Carl's knife; Lori dies during childbirth. Daryl Dixon nicknames the baby "Lil' Asskicker" and Rick Grimes allows Carl to name her after his third grade teacher, Judith Mueller. Judith's fate is seemingly unknown following The Governor's final assault on the prison. Rick and Carl find Judith's empty car seat, stained heavily with blood, and presume her to be dead. However, it is revealed that Tyreese Williams had rescued Judith before escaping from the prison with Lizzie and Mika; the three are walking through a forest, with Tyreese holding Judith in his arms, before they reunite with Carol.
During the year and a half that passed since the end of the war, Judith has been raised by Rick and Michonne where the three live as a happy family in a rebuilt and thriving Alexandria Safe-Zone. Six years later, Magna's group take on a herd of walkers. They quickly get overwhelmed, but are saved when the walkers around them get shot from the trees. Magna and her group escape into the woods to find an older Judith, around nine-years-old, armed with Rick's revolver and a katana. They introduce themselves and ask what her name is; she picks up her hat and introduces herself as Judith Grimes.
Judith later argues with Michonne to allow Magna's group to stay and also shown to have befriended Negan out of pity for his situation. When Negan escapes, Judith lets him go and then escorts him back to Alexandria after she finds him on the road. It is Judith who ultimately convinces Michonne to reconnect Alexandria with the other communities. According to Negan, Judith is just as much of a badass as Carl was and can tell when someone is lying to her, leading to Negan treating Judith with a great deal of respect and being honest with her during his stories of her family and friends.