Joachim Kroll - German serial killer and cannibal.
He was known as the Ruhr Cannibal (Ruhrkannibale), Ruhr Hunter (Ruhrjäger) and the Duisburg Man-Eater (Duisburger Menschenfresser). He was convicted of eight murders but confessed to a total of 13.
Kroll was very particular about where he killed, only killing in the same place on a few occasions years apart. This, and the fact that there were a number of other killers operating in the area at the time, helped him to evade capture. Kroll would surprise his victims and strangle them quickly. Afterward he would strip the body and have intercourse with it, often masturbating over it again. He would then mutilate and cut off pieces to be eaten later. Upon returning home, he would have intercourse again with a rubber sex doll he had for the purpose.