How was Hitler first stopped?

Hitler wasn't stopped by anyone. Hitler and his wife Eva Braun committed suicide by poisoning themselves with cyanide, then Hitler chose to shoot himself in the head. They did this because Hitler knew he was loosing World War 2 and was too much of a coward to be caught by the Soviet troops. Hitler wrote in his will that his body and his wife's were to be burnt where they died. No bodies were ever found.