(AP Photo/FBI) Almost 50 years after 12-year-old Sheila and 10-year-old Katherine Lyon were last seen at Wheaton Plaza, in Wheaton, Maryland, the man convicted of killing them has started serving ...

The Lyon sisters were last seen leaving the Wheaton Plaza Mall ─ now Westfield Wheaton ─ on March 25, 1975. They were both given $2 by their parents and promised their mother a 4 p.m. curfew.