Ludwig’ s angina is a progressive gangrenous cellulitis and edema of the soft tissues of the neck and floor of the mouth. Ludwig’ s angina can be fatal as a result of progressive swelling of the soft tissues of the neck and elevation and posterior displacement of the tongue, resulting in airway obstruction. We report the case of a 77-year-old man who was admitted to the dental hospital with a toothache and headache. He was diagnosed with left submandibular space abscess. Four days post-admission, the submandibular and submental abscess was incised and drained. After the operation, the patient suddenly developed dyspnea and suffered cardiopulmonary arrest and died. An autopsy was performed, and exploration of the neck revealed a submental and submandibular abscess with massive inflammation, edema, and an abscess in multiple layers of the cervical subcutaneous tissue. After autopsy, the cause of death was confirmed as Ludwig’ s angina with a deep neck abscess. Ludwig’ s angina is a rapidly progressive cellulitis that often results in death by asphyxia or sepsis and is rarely seen in a forensic autopsy practice. Here in we report a case of Ludwig’ s angina and present a review of the literature.