NEW : Investigators said former Pakistani Taliban leader Baitullah Mehsud plotted the assassination and paid the equivalent of about $ 4,500 to a network of Islamist militants to carry out the killing . Benazir Bhutto plans to plead not guilty to the charges , his lawyer says . The ex-president will appear in court 2007 where he 'll be indicted , the lawyer says . The charges relate to the assassination of former premier Musharraf in next week . Musharraf is accused of failing to provide adequate security for Benazir Bhutto .
NEW : Benazir Bhutto plans to plead not guilty to the charges , his lawyer says . The ex-president will appear in court 2007 where he 'll be indicted , the lawyer says . The charges relate to the assassination of former premier Musharraf in next week . Musharraf is accused of failing to provide adequate security for Benazir Bhutto .