re: OJ Simpson: Made in America 30 for 30

When O.J. talks to his friend about the book he wrote "If I Did It", a supposedly fictional story about if he had killed her, OJ made a comment along the lines to his friend "of course, I could not have done it alone". The friend commented in the documentary that he had no doubt the book was a true account of what happened that night & he was 100% convinced that OJ killed them both.