This case report details a fatal rectal perforation and sepsis in a comorbid 96-year-old male after traumatic urinary catheterization, highlighting the risks of IDC management in elderly patients with complex health backgrounds. Despite maximal medical therapy, including escalated antibiotics and ICU care, the patient died from septic shock linked to improper catheter insertion by a non-specialist nurse in the community. This case emphasizes the urgent need for better catheterization practices, specialized nursing education, and clear guidelines to prevent such outcomes.