article_snippet: ten-year-old Katherine Lyon and 12-year-old Sheila Lyon went missing on March 25, 1975, after walking to get some pizza at the Wheaton Plaza Shopping Center in Maryland and to look at the Easter decorations .
article_snippet: Parents John and 12-year-old Sheila Lyon have never been able to find out what happened to Parents John and Mary Lyon daughters.
article_snippet: Our department and Our partners in Virginia remain committed to determining what happened to Katherine and Sheila Lyon,' Montgomery Police Chief Tom Manger said in February. '
article_snippet: the girls disappearance profoundly changed the Lyon family.
article_snippet: the girls father, John Lyon, became a victims' advocate in Montgomery County and help counsel other families who had lost loved ones .
article_snippet: Katherine and Sheila disappearance profoundly changed the Lyon family.
article_snippet: Mrs Lyon became a victims' advocate in Montgomery County and help counsel other families who had lost loved ones.
highlights_snippet: 12-year-old Sheila Lyon and ten-year-old Katharine Lyon went missing from a Montgomery County, Maryland, mall in 1975 .
  