GAITHERSBURG, Md. -- Police in Maryland say a convicted child sex offender has been identified as a person of interest in the 1975 disappearance of two sisters who never returned from home a Montgomery County shopping mall.
County police said Monday that the person they want to question is imprisoned in another state and had traveled extensively around the country.
Authorities scheduled a news conference for Tuesday and expect to release more information, including details on why the man is considered a person of interest. Police also are seeking the public's help to learn more about the man.
The announcement could represent a significant break in the investigation into the disappearance of 12-year-old Sheila Lyon and 10-year-old sister Katherine. They went missing after walking to a nearby shopping center.