Not sure what you are looking for Gerd, but I have just come across the photo below which appears to be a portion of the puzzle photo. The translated caption reads:
"In trial runs with the newly constructed Selve SL40 sports car of Selve-chief designer Ernst Lehmann suffers a fatal accident.
Karl Slevogt is called to fill the position of chief designer, he started this activity on 10 October 1924"
The photo title indicates that the person shown is Ernst Lehmann with a Selve SL40 (first one?), so is his death in the new SL40 the info you are seeking?