 In 1985, key expert testimony against Zündel's alleged Holocaust denial was provided at great lengths by Holocaust historian Raul Hilberg, who refused to testify at Zündel's 1988 trial.Zündel was convicted in 1988 and sentenced to 15 months imprisonment by an Ontario court; however, in 1992 in "R v Zundel" his conviction was overturned by the Supreme Court of Canada when the law under which he had been charged, "reporting false news", was ruled unconstitutional.In 1997, Zündel's marriage with his second wife, Irene Marcarelli, collapsed after 18 months.