evidence: Campbell's Purported 'Tell-All Book' In another video that was created for the This Happened YouTube channel on Aug. 21, the title claimed, "Obama's Chef Was Writing a Tell-All Book Before Mysterious DEATH?!" [...] AP previously reported of the claim that Campbell had been writing a "tell-all book" about the Obamas that there was "no evidence" to support the idea, and added that the rumor had "originated from a social media account known to spread misinformation."