Executions, Torture, Recriminations (IV)
OK so I found the grave, and it is marked as Faurisson said, the only difference is that in the intervening 20 years, someone has placed a ceramic rose with the word "Regrets". So the grave is not totally neglected. It certainly seems in decent condition considering the man has no family and was a considered a spy.
I find it frustrating that the only references I can find on Heymès and his torture and death are those by Faurisson or people directly quoting him. My next places to search would be the Resistance Museum at Chasseneiul and Church records. He held an official position as priest to several communes, so the church must have records of when he was appointed, where he came from and his death