On 2.2.1929 Apolonia Kühn was injured on her way home by Peter Kürten who attempted to murder her. It was very difficult to find the exact location as Bertastraße is so different today than it was back then. It is opposite Königsbusch.
In fact I found one building that might implicate where it happened as it looks from the same period. In the photos there is one I took of the house and one taken by the Düsseldorf police after the attempted murder.