Bhutto said OBL murdered

This is a link to a YouTube video of Benazir Bhutto alleging that Osama bin Laden was murdered by one Omar Shaikh – presumed to be Ahmed Omar Saeed Sheikh, who was implicated in the murder of Daniel Pearl, the American journalist. Was this a slip of the tongue, and if not, why did David Frost not pick her up on it? (The bit about OBL was cut out of a subsequent BBC rebroadcast of the interview; you can watch the two clips here.)