Perhaps he did it. Leigh investigates everything, even going into the woods to find more clues. His only hope is a section of footage which reveals the killer. And yes, it's true. It is more horrific than anything imagined, because it makes absolutely no sense.
Logic flies out the door, and with it, so do our hopes of a worthy ending.
What we are given is one of the worst plot twists ever filmed. Also, just for a sidenote, in case you are sensitive to violence, you might want to turn the movie off before the end, since we are witness to a very graphic and disturbing murder scene. His monotone voice is capable of putting anyone to sleep. Thankfully, he isn't on screen much, and he mostly relies on the testimonials of experts for voiceovers. The rest of the actors do semi-credible work, particularly Avalos and Weiler who seem right at home.