Mary Elizabeth Dahn was 31 and working as a cashier at the Riverview Shell in Woodbridge, Virginia, on the evening of December 9, 1986, when a man later identified as Tony Albert Mackall entered the station. Mary and her husband, Stephen Dahn, co-owned the business; their two young daughters, ages 5 and 4, were nearby decorating the station for Christmas when the attack occurred. After Mary handed over $515, Mackall shot her in the head in front of her family.

Investigators linked the killing to a robbery spree Mackall began after escaping from a halfway house less than two weeks earlier. He was arrested and charged in connection with the robbery and murder. Stephen Dahn later sued the District of Columbia and several officials, alleging negligence in failing to apprehend Mackall after his escape; that lawsuit was dismissed. Mary was buried at Quantico National Cemetery in Prince William County, Virginia.

If anyone knew Mary, her family, or has information about the events that night, please share what you know.