Switalski was last seen in Chicago, Illinois on July 15, 1963. She attended a carnival at St. Priscilla's Catholic Church that day. She has never been seen again. Her parents received a letter from her two days after her disappearance, however; Switalski wrote that she was fine and would be sending them some money soon. She never got in touch with them again.

It has been established that Switalski joined an organization that sold magazines door-to-door. It was bound for California at the time. When questioned, the couple who ran the group admitted they had hired her, but gave conflicting statements as to what happened afterwards. The wife said Switalski had left the group sometime before; the husband claimed she had never left Chicago at all.

Switalski's disappearance remains unsolved. Few details are available in her case.