In 1935, he was severely injured in an auto accident, and never resumed painting. His eyesight failing and in deep depression, he committed suicide 3 years later.
[https://www2.stetson.edu/hand-art-center/about/oscar-bluemner/]
FORTY-ONE YEARS AGO, as a fledgling reporter on The Washington Daily News, I wrote an obituary of Oscar Bluemner whom, in youthful flamboyance, I called "The Man Who Saw Red." It was not much more than a brief account of an unsuccessful painter's suicide.
The shortfall in that and in a few other obscure death notices written at the time was matched by a general indifference to him and his paintings during the last agony-filled years of his life.
Not until more than 4 decades after his death has justice been done him. An exhibition of 58 of his landscapes opened in mid-November...
[https://www.washingtonpost.com/archive/lifestyle/1979/12/02/portrait-of-oscar-bluemner-midas-with-a-crimson-touch/c89f323e-97cb-4271-9acb-b9ebd08c790c/?utm_term=.4de0068322c2]