sentences:  Patricia Dunn claimed she did not know beforehand the methods the investigators used to try to determine the source of the leak.Board member George Keyworth was ultimately accused of being the source and on September 12, 2006, he resigned, although he continued to deny making unauthorized disclosures of confidential information to journalists and was thanked by Mark Hurd for his board service.It was also announced at that time that Dunn would continue as chairwoman until January 18, 2007, at which point HP CEO Mark Hurd would succeed her.