Hi,
What was Daisy's last name?
This is likely to be a coincidence but I found two marriages between a Charles Mills and a Daisy in Quebec, one in 1926 and one in 1928.
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Let me know if you see any connection.
Otherwise, it would be hard to find any information regarder Charles Albert Mills, as most genealogical information available relates to births, marriages and burials, and you apparently already have the information pertaining to his death and burial.
Regards,