William Morris Johnston died 12 Feb 1995 in Henderson County, according to the Texas Death Index. His LR on the SSDI, though, was Palestine, Anderson TX.
His wife, Bertie Lou Cameron, died in Palestine in 2010. They are both buried in Hopewell Cemetery.
I suspect he lived most of his later life in Anderson County, went to Henderson to a rest home or hospital and that the local paper published his obituary. That is just a guess, however.
I would appreciate an obituary. He and everyone else named Johnston got recorded as Johnson half the time, and finding him in the census is tough. If I had a couple of siblings I could probably track him down.
He was born 29 Jan 1909 in Kerens, Navarro, Texas. This might be him in 1920 in Navarro County:
M J Johnson 47
Julia Johnson 32
Mattie Johnson 13
William Johnson 10
Thelma Johnson 7
Then again, it might not.