Watched 5x02 last night, and there his daughter asked him if the people he worked with knew who he is?
What does that mean? He is Red John???
I couldn't think of something else.....

She was even smiling when se sat in the car next to him, just like he's fooling you Lisbon, my father is RJ.

And when his daughther says she doesn't care about Red John, he looks very sad. Like he was doing all the killing for his wife and daughter.
His daughter rolled her eyes like on that awnser like she new he had been Red John the hole time. Then PJ looks very sad, especially during the last minutes of the episode, when he is sitting in front of the window.