Well, it would help others to form a more informed opinion about your options and / or point out areas of research if you were to do, as has been suggested on other profile "brickwalls" list where you looked (websites) and when you did so and with what results.
Also if you open your current post and add the tag "research_assistance" and start your post itself with "BRICK WALL" it might gather more attention from those who like puzzles ... more attention is what you want
Also I think you could assume (to suppose to be the case, without any proof) that "Ritter" is being used as a middle name and by which he was most often referred to