James Douglass in JFK and The Unspeakable presented a pretty compelling case for such.  Butch Burroughs, the concession stand operator, and person left in charge of operations at the time, "startled me in his interview by saying he saw a second arrest occur in the Texas Theater, "only three or four minutes later."  pg. 292.  "Burroughs said the second man ''looked almost like Oswald, like they were brothers or something."  Burroughs saw the second Oswald placed under arrest and handcuffed.