BIG BEAR, Calif. (AP) — The extraordinary manhunt for the former Los Angeles police officer suspected of three murders converged Tuesday on a mountain cabin where authorities believe he barricaded himself inside, engaged in a shootout that killed a deputy and then never emerged as the home went up in flames. A single gunshot was heard from within, and a charred body was found inside. If the man inside proves to be Christopher Dorner, as authorities suspect, the search for the most wanted man in America over the last week would have ended the way he had expected — death, …