L'affaire Calavera L'Originale

Montreal, Westmount district, April 14, 1921. Lord Cadavera, hero of the Great War, survivor of the sinking of the Titanic, explorer without borders and British investor has been found dead in his library. You are called by one of your contacts in the local police to solve the enigma surrounding this alleged murder. An initial investigation was able to determine a short list of suspects as well as potential weapons that could have been used. Rumors are rife and the press is racing. For political reasons, the mayor decided to hush up the case and the police are now hand and foot tied. In an hour a specialized team will come to clean up the crime scene. Can you find out who did it and with what weapon before the "specialists" arrive?