Overview
- A 36-year-old German tourist died in a vacation home in Cefalù, Sicily, due to suspected carbon monoxide poisoning.
 - Three family members, including the victim's parents and sister, were found unconscious and are hospitalized in critical condition.
 - Authorities suspect a malfunctioning chimney as the source of the carbon monoxide, though a heating system defect has not been ruled out.
 - The villa has been seized by investigators, and the exact circumstances of the incident remain under investigation.
 - Carbon monoxide, a colorless and odorless gas, is highly dangerous and often undetectable without specialized equipment.