Possible Break in Cold Case

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Maryland police have identified a person of interest in the 1975 disappearance of two sisters.  The Lyon sisters, Sheila 12 and Katherine 10, were walking home from a  shopping center in Kensington, Maryland when they went missing.  Detectives have identified a convicted sex offender who was at the shopping center the day the girls disappeared.  He is currently behind bars in another state.  Montgomery county police plan to release more information Tuesday.