(NewsNation) — Pablo Fenjves, the ghostwriter behind O.J. Simpson’s book, “If I Did It: Confessions of the Killer,” says Simpson “exploded” when Fenjves told him he believed he was guilty.

Pablo Fenjves, the ghostwriter behind O.J. Simpson's If I Did It: Confessions of the Killer, told Newsweek he was shocked at how unaware Simpson was of how "terrible" he came across in the book.