|Richard Allen Welch|
The younger Welch, 57, was a carnival worker, and denies any involvement in the Lyon sisters' disappearance. Richard Welch is described by police as a security guard who worked near Wheaton Plaza. His current residence is given as Hyattsville.
A major recent development in the investigation has led detectives to the area of Bedford County, Virginia, where the Welch family owned land in the 1970s.
Police are asking anyone who has any information to offer regarding Richard Allen Welch's alleged involvement in the girls' disappearance to contact them immediately.
Photo via Bedford County, VA Sheriff's office