The Social Security Death Index:
Joseph R. Larsen, born 28 Sep 1926, died 12 Mar 1994, "last residence:" Montrose. The "last residence" on the SSDI is NOT necessarily where they lived or died.
I find one family tree hold his info, but only shows the date of death. His wife was Dorothy June Morris, born Oct 30, 1927 in Ottumwa, IA, died Sep 3, 1986 in Olathe, Montrose Co, CO (no source). She was dau of Henry Leonard Morris and Gladys Morea Dickerson. No children shown in the data.
--I checked the Olathe cemetery records but did not see her name.
I checked the Montrose County Recorder's records, there were no recorded documents in his name. For Dorthy, there were three documents recorded on 10/11/2005. One was her Death Certificate, (listed twice), the other was identifying April L. Sanchez as Dorothy's personal representative. It is odd that the documents weren't recorded so long after the death. It is also strange the estate did not go to Joseph since she died first; unless they were divorced at that time. OR, this is another Dorthy June.http://oncore.montrosecounty.net/
A DAR Memorial for Dorothy:http://www.uncompahgrevalleydar.org/organizers.htm#memoriam
They may know more about her, might even have her obit in their records. I'd suggest contact of their Historian.
The Montrose Genealogy Center charges $40 deposit.