17 April 1933 (+) is born in Hindenburg in Oberschlesien, Poland.

8 February 1955 (-) sexually assaulted and stabbed to death Irmgard Strehl in Herrenstein, Germany.

24 March 1959 (-) attacked Erika in Duisburg, Germany.

17 June 1959 (-) sexually assaulted and strangled Klara Tesmer in Duisburg, Germany.

26 July 1959 (-) strangled and mutilated Manuela Knodt in Essen, Germany.

23 April 1962 (-) sexually assaulted and strangled Petra Giese in Dinslaken, Germany.

4 June 1962 (-) sexually assaulted and strangled Monika Tafel in Walsum, Germany.

3 September 1962 (-) presumably strangled Barbara Bruder in Burscheid, .

22 August 1965 (-) stabbed to death Hermann Schmitz in Duisburg, Germany.

13 September 1966 (-) sexually assaulted and strangled Ursula Rohling in Marl, Germany.

22 December 1966 (-) sexually assaulted and drowned Ilona Harke in Hückeswagen, Germany.

22 June 1967 (x) attacked Gabrielle Puetman in Bottrop, Germany.

12 July 1969 (-) sexually assaulted and strangled Maria Hettgen in Essen, Germany.

21 May 1970 (-) sexually assaulted and strangled Jutta Rahn in Breitscheid, Germany.

16 September 1971 (x) moves into his new flat in Duisburg, Germany.

8 May 1976 (-) abducted and strangled Karin Toepfer in Voerde, Germany.

2 July 1976 (x) sexually assaulted, strangled and partly eaten Marion Ketter in Duisburg, Germany.

4 October 1979 (x) Start of the trial against Kroll in Duisburg, Germany.

8 April 1982 (x) is sentenced to life imprisonment in Duisburg, Germany.

1 July 1991 (-) dies of a heart attack in Rheinbach, Germany.