This handout image provided by the Montgomery County, Md., Police Department shows the Montgomery County Police mugshot of Lloyd Welch in 1977 after Welch was arrested for a residential burglary near Wheaton Plaza. Police in Maryland say Welch, a convicted sex offender currently imprisoned in Delaware, has emerged as a person of interest in the disappearance of the two young sisters, Sheila Lyon and Katherine Lyon in Maryland in 1975. (AP Photo/Montgomery County, Md., Police Department)
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