I don't know which resources you have already used in your research, so I'll assume you didn't comb through these for more information:
(1) Lovell's directories for Montreal over the years.
(2) JOWBR database for Montreal cemeteries.  The vast majority of gravestones have been photographed.
(3) Montreal obituaries - best through Newspapers.com, if you can access it.
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Steve Goldberg
Jerusalem, Israel
Researching:
Sagan/Shagan family from Veliuona (Velon), Lithuania
Goldberg family from Vidukle, Lithuania
Susselovitch/Zuselovitch family from Raseiniai (Rassein), Lithuania