I just heard back from R M of Martin #122 and tax records for Dan Robertson (Donald) indicate the land NW Section 12 Township 14 Range 33 W1 was sold in 1945 taxes were paid till than in 1946 the land was sold to someone named McFayden.
Donald's residence was listed as Redjacket which is in that area of Saskatchewan.
I called Wapella and the lady in the town office mentioned she ran across a box of vital statistic records. She is going to take a look to see if there might be a death for Donald and if found she will email it to me.
If nothing found you can contact Saskatchewan Vital Statistics for the genealogical long copy of his death.
My fingers crossed that she finds a registration, she mentioned she might not get to it until next week.
I am doing the happy dance for you.

Lilybell