Brian,
I still check out your site once in awhile, to see if I can learn anything new about our old friend. Like you, I’m still hoping to someday learn more about his final days. I’m attaching some early photos, which you may already have. The first one is the cast of “Dr. Christian” which debuted on CBS radio in 1937. I don’t know the dates of the other two, but they’re most likely from the 30’s.
Don H
Dr. Christian 
Walter Tetley in kilt 
Walter Tetley NBC
Thanks a bunch. I like the last one the best. He really looks like a kid in these particular pix.
Brian