Hi You have posted to the Message Board for Banff Alberta Canada.
There does not appear to be any connection to Banff Alberta - or Canada.
Your research for Francis Michael SHANAHAN - nick names Frank or Mike
appear to be in the State of Alaska - Washington State - Nevada Texas and California
You mention death in 2005 in Clute Texas Obituary may have been published there.
Registration of Death - Long form Death Certificate - will show personal information as required at the time - as known to the informant.
Perhaps searching Family Search Org Online
https://familysearch.org/search