Question: what episode does lori die on the walking dead
[{'answer': 'Killer Within', 'provenance': [{'wikipedia_id': '34936628', 'title': 'Lori Grimes', 'start_paragraph_id': 33, 'start_character': 61, 'end_paragraph_id': 33, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Reception.:Critical reception.\n'}]}, {'answer': "`` Killer Within ''"}, {'provenance': [{'wikipedia_id': '34936628', 'title': 'Lori Grimes', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 946, 'bleu_score': 0.9877670085238551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7032419966999650245}, 'section': 'Section::::Reception.:Critical reception.\n'}]}, {'provenance': [{'wikipedia_id': '34936628', 'title': 'Lori Grimes', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7032419966999650245}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34936628', 'title': 'Lori Grimes', 'section': 'Section::::Reception.:Critical reception.\n', 'start_paragraph_id': 33, 'end_paragraph_id': 33, 'meta': {'evidence_span': ['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.', 'Killer Within', '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.']}}]}, {'provenance': [{'wikipedia_id': '37818974', 'title': 'Beth Greene', 'section': 'Section::::Appearances.:Season 4.\n', 'start_paragraph_id': 9, 'end_paragraph_id': 9, 'meta': {'evidence_span': ['to assisting Hershel throughout his recovery, and also becomes a caretaker for Judith after Lori Grimes (Sarah Wayne Callies)\'s death in the episode "Killer Within".', 'Killer Within', 'to assisting Hershel throughout his recovery, and also becomes a caretaker for Judith after Lori Grimes (Sarah Wayne Callies)\'s death in the episode "Killer Within". Beth has developed a relationship with one of the prison newcomers, Zach (Kyle Gallner)']}}]}]