What Happened to Jimmy Hoffa?

Jimmy Hoffa was murdered on July 30th, 1975, in Bloomfield Township, Michigan. This information is all over the internet, however, how do they know that he was murdered, if they haven’t been able to find the body? Oops… I shouldn’t be answering a question with a question, therefore, the answer to this question would have to be that no one knows what happened to him.