A serial rapist went unchecked for more than 20 years in Hamilton despite two police investigations and his martial arts club being warned. Stephen Wallace, the owner of Incorporated Martial Arts in Hamilton, was found dead at his home in September after police launched a third investigation into sex abuse claims. The police said they could not push the earlier cases to prosecution because of a lack of evidence.But one man who says he was a victim, who does not want to be named, said this i...