The transcript of the 1913 death cert at FamilySearch shows Louis
Touchet interred in St. Raymond's.
From the data on the cert, can you tell if this is your man?https://www.familysearch.org/ark:/61903/1:1:2WD5-BXW
When you visited in 1969 did you take a photo of the stone? Is it identical to the one in St. Raymond's?