First of all you people thinking that it is patrick jane, that is just ridiculous the show would make no sense if it was him and why would he kill his own wifr and daughter? I think it is Bret Stiles as in the episode called the red barn one of the three victims belonged to visualize and on the side of the barn there is red johns signature. Also these three people were killed roughly 25 years ago way before red john was even on the scene. The three victims are traced back to being members of Visualize and thr leader of visualize is the one and only BRET STILES.