Rene Kojfer, 74, former public relations manager for the luxury Carlton Hotel in the northern city of Lille, is accused of running a high-end prostitution ring that organised sex parties for local businessmen and police officials, often in his hotel.
It was during a probe into the so-called "Carlton Affair" that investigators stumbled across the alleged involvement of Strauss-Kahn, whose high-flying career and presidential prospects imploded when a New York hotel maid accused him of sexual assault in 2011.
Strauss-Kahn said yesterday he had never set foot in the Carlton and did not know Kojfer and notorious Belgian brothel-owner Dominique Alderweireld, known as "Dodo the Pimp", who employed the prostitutes that attended the sex parties with him.
While his is only a small part in the multi-faceted trial, the disgraced 65-year-old former finance minister -- known in France as DSK -- is the star attraction at the austere courthouse in Lille. However he will not be in court again until he takes the stand himself next week.
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Bernard Lemaire, the chief of the four judges who will oversee the three-week, jury-less trial, read out the charges against Kojfer of organising and benefiting from the prostitution of eight women, some of whom attended the DSK orgies.
Kojfer denies the charge of "aggravated pimping", saying he was merely doing a service for his friends by introducing them to the prostitutes he knew.
His lawyer, Hubert Delarue, sought to portray Kojfer as a man who revelled in having friends in high places, but who was naive, suffered from alcoholism and was given to telling tall tales about his ties to powerful people. Kojfer agreed with this, even revealing he had been beaten by his ex-wife.
"Do you really want us to believe that all these people would be friends with a simple fellow, a naive person? That you had nothing else to offer?" asked prosecutor Aline Clerot.
Lurid details of group sex and high-end prostitution are likely to emerge in the trial, which has Strauss-Kahn sharing the dock with a colourful cast of characters including luxury hotel managers, a prostitute, police, as well as "Dodo the Pimp.