On 22 September 1977 Folkerts and Elisabeth von Dyck set out to return a car to a Dutch car rental business . The car had been rented by Sigrid Sternebeck and used in connection with the kidnapping and murder of Hanns Martin Schleyer . The surroundings were under surveillance and the police tried to arrest Folkerts . Folkerts fatally shot Dutch policeman Arie Kranenburg ( born 10 June 1931 ) and seriously wounded a second officer . Folkerts was arrested , Elisabeth von Dyck , originally mistaken for Brigitte Mohnhaupt , managed to escape
kidnapping and murder
Kidnapping and murder of Hanns-Martin Schleyer
Knut Folkerts