"I realized how powerful the media was because I walked in with people not knowing me and I walked out on the first day with people screaming my name," Kaelin said. "I realized this is the most powerful medium and that was before social media. It got so bad that I never wanted to go out."
Other cast members include American Horror Story's Sarah Paulson, who stars as prosecutor Marcia Clark; Malcolm-Jamal Warner, who plays O.J.'s friend and former teammate Al Cowlings; Friends star David Schwimmer, who plays Kim Kardashian's late father, attorney Robert Kardashian; John Travolta, who stars as attorney Robert Shapiro; Selma Blair, who plays Kris Jenner; and Oscar winner Cuba Gooding Jr., who portrays O.J.
"Robert Shapiro, I thought, was a very compassionate man and I think Travolta will be incredible," Kaelin said. "When they first had David Schwimmer casted I go, 'Are you kidding me?' and then I saw the picture. They did kind of the Pepe Le Pew and I said, 'Wow!'"
Despite his first-hand knowledge of the trial, Kaelin still anticipates that he'll be captivated by the series.