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- "Ma'am, should I take watch now?"
- —Luke to Carol during knife lessons.[src]
Nothing is known about Luke's life before or as the outbreak began.
Luke is seen playing with some of the other children in the prison yard, naming the zombies at the fences. Later, Luke is at storytime listening to Carol read. When Carol pulls out the knives to teach how to use them, Luke asks to go on watch and Carol excuses him.
Luke is briefly seen trying to escape the walker incursion of cell block D. He is almost grabbed and eaten by a zombified prison resident, however Daryl comes to his aid and rescues him, carrying him away from the newly reanimating dead in one hand and firing a crossbow bolt into the attacking walker's head with his other. He is handed off to Karen, and takes shelter in a cell with her, David, Molly, and another girl.
Luke appears in this episode when he is quarantined in Cell Block A, indicating that he has come down with the sickness as well. He's first seen in this episode playing checkers with Jeanette. Hershel puts him and Lizzie in a cell while fighting off the prison newcomers who have reanimated.
Luke is seen running out of the prison with a bag of supplies after being told to go to the bus after the watch tower is blown up by the tank. Lizzie stops them and tells the group to be strong like Carol told them to, and not to be scared and weak. He is later seen in the episode next to Lizzie, Mika, and Molly after Lizzie and Mika save Tyreese by shooting Alisha and another man in the head. They then retreat back into the remains of the prison with Tyreese after the bus of survivors are forced to leave them behind.
As the prison was being attacked, and the prison bus had already left, Luke and Molly ran off in the midst of it and presumably ran into the woods. Their bodies were later found by Beth and Daryl, so they were most likely devoured.
Luke and Lizzie seem to have a normal and friendly relationship. They are often seen playing together in the prision yard. After the prison was overrun, Luke along with Lizzie and the other children took off with Tyreese. It is assumed they do care for eachother.
Luke and Mika seem to have a casual and friendly relationship, as they are mostly seen playing together. She is seen with Luke in "30 Days Without An Accident" near the fence looking upon the zombies. Luke and Mika are also seen together when Carol was teaching them about using knifes. Luke and Mika also work together to flee to the prison bus and escape the prison during the Governor's attack.
Luke and Molly seem to have a good relationship with each other. They are often seen together playing with Mika and Lizzie. The two are often seem together so it is assumed they get along well.
Luke and Beth aren't seen interacting, but it is assumed they had a good relationship. This is shown by how Beth is cheered up and hopeful when she tells Daryl that the footprints they found could be Luke's or Molly's.
- The casting call used the name "Luke" for this character, though the name was later changed to something else. However, "Luke" was brought back as the character's name because of two reasons: Luke is the actor's name and is also Angela Kang's brother's name.
- While it was never confirmed, Luke Donaldson mentioned in an interview that people had speculated that Luke and Molly may have been siblings, and that they had come from Woodbury with the remaining townspeople after the failed prison assault (neither filmed for Season 3).