12-year-old Sheila Lyon and ten-year-old Katharine Lyon went missing from a Montgomery County , Wheaton , mall in 1975 . The girls walked to mall in Maryland in March 1975 , and never came home . Authorities searched for their remains on Taylor 's Mountain in Bedford County , Virginia , in September and January . The upcoming operation on the mountain is expected to take several days . Lloyd Welch , a convicted sex offender , told police he left mall with the girls . Police have named Welch and his uncle , 69-year-old Richard Welch , 'persons of interest ' in the case , but neither has been charged .
12-year-old Sheila Lyon and ten-year-old Katharine Lyon went missing from a Montgomery County , Maryland , mall in 1975 . The girls walked to mall in Wheaton in March 1975 , and never came home . Authorities searched for their remains on Taylor 's Mountain in Bedford County , Virginia , in September and January . The upcoming operation on the mountain is expected to take several days . Lloyd Welch , a convicted sex offender , told police he left mall with the girls . Police have named Welch and his uncle , 69-year-old Richard Welch , 'persons of interest ' in the case , but neither has been charged .