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(CNN) - The two little girls vanished nearly 40 years ago, their disappearance long faded from the public consciousness, their names etched in a stone marker their hope-sapped parents placed in a local cemetery.
But Maryland police have been tenacious about solving this cold case. And on Tuesday they breathed new life into it, when they announced a possible breakthrough.
Convicted sex offender Lloyd Lee Welch Jr., 57, who's been serving a prison sentence in Delaware since 1997, was near Sheila and Katherine Lyon on that March day in 1975 when they went missing, Montgomery County Police Chief J. Thomas Manger told reporters Tuesday.