Question: What Nazi German murdered Walther Kadow?

Context paragraphs:
Valley of Death (Bydgoszcz): Valley of Death (Polish: "Dolina Śmierci" ) in Fordon, Bydgoszcz, northern Poland, is a site of Nazi German mass murder committed at the beginning of World War II; and a mass grave of 1,200 – 1,400 Poles and Jews murdered in October and November 1939 by the local German "Selbstschutz" and the Gestapo.  The murders were a part of Intelligenzaktion in Pomerania, a Nazi action aimed at the elimination of the Polish intelligentsia in Reichsgau Danzig-West Prussia, which included the former Pomeranian Voivodeship ("Polish Corridor").  It was part of a larger genocidal action that took place in all German occupied Poland, code-named Operation Tannenberg.

Nazi crimes against the Polish nation: Nazi German crimes against the Polish nation claimed the lives of 2.77 million ethnic Poles and 2.7 to 2.9 million Polish Jews, according to estimates of the Polish government-affiliated Institute of National Remembrance (IPN).  Historians outside Poland put the number of Jewish victims of the Holocaust in occupied Poland at 3.0 million.  The original assumptions of Generalplan Ost were based on Nazi plans to exterminate around 85% (over 20 million) of the ethnically Polish citizens of Poland, with the remaining 15% to be used as slaves.  The dissemination of knowledge on the subject of Nazi German crimes in World War II was entrusted by an Act of the Polish Parliament in 2000 to the Institute, which replaced the former Main Commission for the Investigation of German Crimes against the Polish Nation.

Kamianets-Podilskyi massacre: The Kamianets-Podilskyi massacre was a World War II mass shooting of Jews carried out in the opening stages of Operation Barbarossa, by mobile killing squads of Nazi German Order Police Battalion 320 along with Jeckeln's "Einsatzgruppen", the Hungarian soldiers, and the Ukrainian Auxiliary Police.  The killings were conducted on August 27 and August 28, 1941, in the Soviet city of Kamianets-Podilskyi (now Ukraine), occupied by German troops in the previous month on July 11, 1941.  According to the Nazi German reports a total of 23,600 Jews were murdered, including 16,000 who had earlier been expelled from Hungary.

Walther PPS: The Walther PPS ("Polizei-Pistole Schmal" / Police Pistol Slim) is a semi-automatic pistol developed by the German company Carl Walther GmbH Sportwaffen of Ulm for concealed carry for civilians and plainclothes law enforcement personnel.  It is available in either 9×19mm Parabellum or .40 S&W chamberings.  It was first shown in 2007 at the IWA & OutdoorClassics and is a slim polymer framed weapon of similar size to the Walther PPK pistol.  The PPS is however technically much more based on the Walther P99 pistol.

Carl Walther GMBH: Carl Walther GmbH Sportwaffen ] , or simply Walther, is a German arms manufacturer.  For more than 100 years, Walther has manufactured firearms and air guns at its facility in Germany.  Carl Walther Sportwaffen is a subsidiary of the PW Group.  Walther Arms, Inc. is the USA representative for Walther business and is located in Fort Smith, Arkansas.

Walther Kadow: Walther Kadow (1860 – 31 May 1923) was a German school teacher who was murdered by Rudolf Höss and accomplices in May 1923 in the forest near Parchim.  Kadow was member of the rightwing German Völkisch Freedom Party, and was suspected of having betrayed German nationalist Albert Leo Schlageter to the French occupation authorities in the Ruhr.  Schlageter was executed by the French and was later regarded as a martyr by the Nazis.  Höss received a ten-year sentence for the revenge killing, while his accomplice, Martin Bormann who was a former student of Kadow, was sentenced to one year in prison for his part in the murder.

Fritz Katzmann: "SS-Gruppenführer" Fritz Katzmann or Friedrich Katzmann (6 May 1906 – 19 September 1957) was a Nazi German Major General and "Polizei" leader who perpetrated genocide in the cities of Katowice, Radom, Lemberg (Lwów), Danzig (Gdańsk), and across the Nazi German District of Galicia during the Holocaust in occupied Poland.

Sobibór extermination camp: Sobibór (or Sobibor , or , ] ) was a Nazi German extermination camp built and operated by the SS near the railway station of Sobibór during World War II, within the semi-colonial territory of General Government of the occupied Second Polish Republic.  The camp was part of the secretive Operation Reinhard, which marked the deadliest phase of the Holocaust in German-occupied Poland.  The camp was situated near the rural county's major town of Włodawa (called "Wolzek" by the Germans), 85 km south of the provincial capital, Brest-on-the-Bug (Brześć nad Bugiem in Polish).  Its official German name was "SS-Sonderkommando Sobibór".  Jews from Poland, France, Germany, the Netherlands, Czechoslovakia and the Soviet Union (including Jewish-Soviet POWs), were transported to Sobibór by rail.  Most were suffocated in gas chambers fed by the exhaust of a large petrol engine.  Up to 200,000 people were murdered at Sobibór and possibly more.  At the postwar trial against the former "SS" personnel of Sobibór, held in Hagen two decades into the Cold War, Professor Wolfgang Scheffler estimated the number of murdered Jews totalled a minimum of 250,000.  This would make it the fourth worst extermination camp, after Bełżec, Treblinka, and Auschwitz.

Rudolf Höss: Rudolf Höss (also Höß, Hoeß or Hoess; 25 November 1901 – 16 April 1947) was a Nazi German "SS"-"Obersturmbannführer" (lieutenant colonel) and the longest-serving commandant of Auschwitz concentration and extermination camp in World War II.  He tested and carried into effect various methods to accelerate Hitler's plan to systematically exterminate the Jewish population of Nazi-occupied Europe, known as the "Final Solution".  On the initiative of one of his subordinates, SS-"Hauptsturmführer" (captain) Karl Fritzsch, Höss introduced pesticide Zyklon B containing hydrogen cyanide to the killing process, thereby allowing SS soldiers at Auschwitz to murder 2,000 people every hour.  He created the largest installation for the continuous annihilation of human beings ever known.

Többens and Schultz: Többens and Schultz (German: "Többens und Schultz & Co" ) was a Nazi German textile manufacturing conglomerate making German uniforms, socks and garments in the Warsaw Ghetto and elsewhere, during the occupation of Poland in World War II.  It was owned and operated by two major war profiteers: Fritz Emil Schultz from Danzig, and a convicted war criminal, Walter C. Többens (i.e. Walther Caspar Toebbens, from Hamburg).

Supporting paragraphs: Walther Kadow Rudolf Höss
Answer: Rudolf Höss