In his 2005 and 2006 biographies of Druitt, D. J. Leighton concluded that Druitt was innocent, but repeated some of Knight's and Wilding's discredited claims. Leighton suggested that Druitt could have been murdered, either out of greed by his elder brother William or, as previously suggested by Howells and Skinner, out of fear of exposure by Harry Wilson's homosexual cronies. The propensity of some theorists to associate Ripper suspects with homosexuality has led scholars to assume that such notions are based on homophobia rather than evidence.