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A man died after a surgery for the perforation of the colon wall with signs of diffuse purulent peritonitis. Autopsy shows that the mucosa of the colon wall is thickened, covered in a fibrinous membrane, and has isolated ulcers that penetrate it to varying depths. Histology detects mucosal necrosis, the presence of fibrin, and leukocyte infiltration with hemorrhagic foci. What disease developed a complication in this case, causing the death of this man?