Robert Kardashian, one of O.J. Simpson’s closest friends, supported him throughout his murder trial. He even accepted a role on Simpson’s legal dream team, suggesting that he believed his friend didn’t commit the 1994 murders of Nicole Brown and Ronald Goldman.

However, Ryan Murphy’s autopsy of the case – the gripping true crime drama The People v. O.J. Simpson – suggested that Kardashian was skeptical of his friend’s innocence throughout the trial and culminated with Kardashian (played by David Schwimmer) leaving Simpson’s “welcome home” party in disgust. The implication was clear: Kardashian thought Simpson was guilty and felt complicit in his acquittal.

In her new book The Secrets of My Life, Caitlyn Jenner confirms that Kardashian believed Simpson was guilty all along. In excerpts obtained by Radar Online, Jenner – who married Kardashian’s ex-wife Kris Jenner – writes that Kardashian once told her that he “would’ve been okay with it if they had gotten him in the first trial,“ referring to the murder trial and the civil suit that followed.

“The implication was obvious that he believed O.J. was guilty,” Jenner writes, adding that she believes Simpson “got away with two savage murders.”

So why would Kardashian agree to defend a murderer? According to Jenner, it was to get back at Kris – who hated Simpson and was close friends with Nicole – for marrying her (when she went by Bruce Jenner).

“I wonder if it was his way of saying to her what I think she was saying to him when she married me: a big f–k you,“ Caitlyn writes.

In a less revealing but equally scathing excerpt from the upcoming memoir, Jenner says that Simpson was, at his core, an awful human being.

“He was the most narcissistic, egocentric, neediest a–hole in the world of sports I had ever seen, and I had seen a lot of them,” she writes.

Simpson is currently in a Nevada penitentiary serving 33 years for armed robbery and kidnapping. He’s up for parole in just a few months.