He posted on twitter. The cameraman went to HR on him after working with him one time They hired her after that.
There's a youtube video of it, too, and cuts off right as he points the gun. At least he is doing his best to help the prosecution convict him. Very generous.
This guy is obviously insane, and I will not be surprised if he kills himself before he is caught. The police need to be very careful because I doubt he goes quietly.