Shattered Glass is an excellent portrait of a pathological liar. Hayden Christensen actually gives a really good performance which is further proof of how badly written/produced the Star Wars prequels were. Peter Sarsgaard is great also, but he always is. And the fact that it's based on a true story makes it even more interesting. It's free to watch on Youtube.
Was this the reporter who basically made up everything he wrote? I know that sounds like every reporter these days.