Helen Irene Allison was 16 when she was last seen in Fairfax, Virginia, on May 11, 1972. After school at Bishop Dennis J. O'Connell High School in Falls Church, she was given a ride to a Jack-in-the-Box restaurant but never made it home. She missed school the next day and was reported missing.

At the time she disappeared Helen was described as a white female, brown hair, blue eyes, 5 feet 3 inches and about 115 pounds, wearing a white blouse, a pleated blue and gray skirt and a white knit sweater. It is not publicly known why she was dropped off at that Jack-in-the-Box, which location it was, or whether she went to the Washington D.C. area after she vanished. Family DNA has been submitted for comparison with unidentified remains and the Fairfax County Police Department continues to list her as a missing person.

If anyone knew Helen, saw her in May 1972 near Fairfax or the D.C. area, or has information about that Jack-in-the-Box drop-off, please come forward.