premise: When Adolf Hitler heard of how Mussolini was executed and put on public display, he vowed he would not let this happen to him. Hitler shot his mistress and new wife, Eva Braunn, and then swallowing some poison, he shot himself in the mouth.
hypothesis: Mussolini did not commit suicide.
reason: Mussolini was executed, so he could not have committed suicide.  Hitler is the one who committed suicide.