The Mad Gasser of Mattoon was a mysterious figure who haunted Mattoon, Ill., in the summer of 1944.

Typically, homeowners would report awakening to a sweet odor, then feeling nausea, dizziness, headaches, breathing difficulty, or a feeling of paralysis. Some saw a tall figure dressed in black fleeing their property after the attack.

Police and citizens patrolled the streets, and the newspapers printed several sensational accounts, but the police never found a suspect. The attacks stopped after Sept. 13, as mysteriously as they had begun.