Once he vanished, and the story came out, no one believed them, and all hell broke loose. Some believe that he just took the money and deserted his family. Some think that the NY Masons did him in, probably in a ritualistic way. Others think that the Canadians really did accept him from the NYers, but that then they killed him. By now, there's probably no one that really knows.
Masons widely consider the whole affair ironic and unfortunate.
If they'd have ignored Morgan, he and his book would have sunk into the obscurity that quickly swallowed most other Masonic exposures. The affair did tremendous damage to Masonry throughout the country for a long while after. There are many books on the subject, of course. I personally think it would make a great Broadway musical. I should have been more specific.