So you are looking for the elusive Asery Mull too. I have found a gravemarker for A. W. Mull 1883-1931 on findagrave.com, Find A Grave Memorial# 89321276. Bearing in mind that he was living in Howe during the 1930 Census I think this might be the right one. He is buried at Howe Cemetery, Howe, Le Flore County, Oklahoma, USA.
Unfortunately, that is the only record I have found of his death.
I have "googled" Howe but it seems there is not much going on there now so it must have relied heavily on the railroad and coal mines in 1920's and 1930's.
I do hope this has helped,