:Beats me, I've seen it and thought Beecher pushed him, (Though not intending to kill him) but later when he spoke with Peter Marie she asked him if he pushed Keller and he told him that he didn't. He could have been lying to save his own ass, but he sounded quite sincere to me. (And somehow I believe his character would have taken the responsibility for such an action - but then again, I may be naive ))