The patient, a 16-year-old female, presented with a history of systemic lupus erythematosus diagnosed in 2021 and was admitted for abdominal pain, vomiting, and loss of appetite. Her condition deteriorated and she developed sepsis. Laboratory findings showed anemia, leukocytosis, renal impairment, and markers consistent with active lupus. Despite aggressive management including intubation, pressors, and pulsed steroids, her condition continued to decline and she suffered cardiac arrest. She could not be resuscitated and was declared dead. The final diagnosis was septic shock, enterocolitis from mesenteric vasculitis, and active systemic lupus erythematosus involving hemolytic anemia