This thread discusses a number of different potential suspects which were suggested over the past 20 years or so.
Although Lloyd Lee Welch, Jr. was arrested, charged and pleaded guilty to abducting and murdering the Lyon sisters, Sheila and Katherine, it is obvious that he did not do this alone, but rather with others.
Who were those others? How did they contribute to this heinous crime? and where are the bodies of Sheila and Katherine? Who were the other victims of this lot of criminals?
The Montgomery County Police and other Law Enforcement Agencies seem to have claimed victory and closed the case, but it should be considered an open one and investigation should continue.