Four years ago, on April 10, 2009, ABC's magazine show, 20/20 decided to put that theory to the test. The segment with Diane Sawyer was titled, "If I Only Had a Gun.” And the only thing that got blown away was the lunatic theory.
Here's that fascinating story. It's divided into two separate videos, but they should run back-to-back automatically. The video begins a few seconds in, so don't be surprised if if seems like you've jumped in mid-sentence. You have.