I'm sorry if this has already been posted several times (I didn't find any, though) but I'm sure you guys and gurls noticed the person walking past the interrogation room (where Jane, Lisbon and Smith were in) who was whistling.

What was that? Why would the writers pull a random whistling (as it's kinda been a red herring thorough this season because so many of the suspects have been doing it) one episode before the final big reveal? What melody was the person whistling? Why they made it so obvious you couldn't undetect it? Why Smith suddenly got so scared and asked if they are really able to keep him safe, when he saw (and/or heard) the whistlerer? Why did the person walk like Red John did in the finale of season 2 (very slowly and calmly)? Why the shoes he was wearing sounded just like Red John's boots in the finale of season 2 when they hit the floor?

Really, what was that? I'm throwing Kirkland's picture in just because the person seemed to have sleek black hair, even though the picture wasn't clear.