At the end of the Season 2 or 3 when Jane is knocked out and tided to a chair and RJ comes, he looks with a medium build not heavy (fact corroborated by Rosalind, the blind lady that had a physical relationship with RJ.  She has said that RJ has a slight build but athletic), so that excludes Gale Bertram and Reede Smith. Brett Partridge and Bob Kirkland are dead so that excludes them (Unless the guy who was shot in the last episode was not really Bob but his twin brother…) Bret Stiles is too old and Thomas McAllister was excluded since he was not acrophobic… If all this is right… Ray Haffner is RJ