The fates of Lori and the character of T - Dog in the episode `` Killer Within '' garnered favorable reviews from television commentators . According to HitFix writer Alan Sepinwall , the moment when Lori and Carl share their goodbyes was the most heartbreaking event since the ending of the second season episode `` Pretty Much Dead Already '' . Los Angeles Times columnist Laura Hudson felt it was a grim departure for a character who endured long bouts of grief for reasons beyond her control . Erik Kain from Forbes magazine found Lori 's death especially difficult to watch , and was shocked by T - Dog 's `` sudden '' death despite the fact that he `` was never as prominent a figure '' on the program . `` As hard as these deaths were to watch , '' Kain wrote , `` they also give me faith in the show . '' Even though he stated that T - Dog died `` a hero 's death '' , Michael Rapoport of the Wall Street Journal concluded that Lori 's `` gut - churning '' demise was the more memorable .

Question: what episode does lori die on the walking dead
Answer: Killer Within