i think red john is a woman, in 2x23 when rj meet pj if you look at the top of red john's head (there is a Bulge) why ??? because he is a woman , woman lift their hair up when they wear a hat , or a helmet , or a cloak , and his voice is similar to Margo Ketchum , played by thleen Wilhoite , she is in the same episode 2x23