O.J. Simpson's parole hearing dominated headlines Thursday and reignited old rumors — like his relationship with Khloé Kardashian. Kardashian, who is the daughter of reality television star Kris Jenner and Robert Kardashian Sr., has been long rumored to be Simpson's illegitimate child.

Simpson had two children with late wife Nicole Brown Smith named Sydney Simpson and Justin Simpson. He also had three children with his first wife, Marguerite Whitley. Kardashian, who has denied the validity of the rumors before, has been speculated to be his sixth child.

Read: Who Is Malcolm LaVergne? OJ Simpson's Lawyer Is Key Figure In Parole Hearing

Many believe Kardashian shares no resemblance with her proclaimed birth father, which has led them to believe that the two are not blood relatives. According to New York Daily News, the reality star joked about her biological father on Instagram in 2016, saying, "I don’t know ... Some days I’m OJs daughter. Others I’m Roberts daughter."

Jenner, who was married to Simpson's attorney and best friend Kardashian Sr., was reportedly with unfaithful during her marriage to the deceased lawyer. Kardashian talked about the effects her mother's affair had on her father Kardashian Sr. on an episode of  "Kocktails with Khloé," saying, "I saw how it destroyed my dad. I saw what it did to my dad...I also saw the regret from my mom."  

Jenner also spoke about her affair in the 2011 memoir, "Kris Jenner and All Things Kardashian," referring to the man with the pseudonym of "Ryan." Her infidelity ended in 1990, right before she became acquainted with her ex formerly known as Bruce Jenner, who is now named Caitlyn Jenner. However, the infidelity she described doesn't follow the narrative of her alleged connection to the NFL alum because she claimed that "Ryan" was 10 years younger than her. Simpson, 71, is nine years older than Jenner.

Jefferey Felix, a retired prison guard who befriended the pro-footballer at Lovelock Correctional Center, claimed in the Reelz documentary "Kardashian: The Man Who Saved O.J. Simpson" that Simpson spoke to Kardashian while behind bars, according to Extra TV

Read: Khloe Kardashian Pregnant? Tristan Thompson Snap Sparks Baby Rumors

"Khloé is his favorite. The mom Kardashian does not talk to O.J.," Felix said in the film. "She's upset with O.J. for her thinking that he killed her best friend, Nicole Brown. But I know he still talks to Khloé behind her back. In the prison, the phone calls have to be made out by O.J., so he would call at least once a week. That was his way of keeping up with the Kardashians."

Felix reportedly revealed a phone exchange between Kardashian and Simpson, claiming she requested that he take a paternity test. 

"She was very upset and O.J. was trying to calm her down. One day I could hear Khloé screaming in the phone," he added. "He said she was upset because she wanted him to take a paternity test because the media is all over him, to see if O.J. is her actual dad — and O.J. told her 'no.' A few minutes after that phone call he pulled me up and asked me what I would do, and I told the Juice to take it, and he said 'no.' And I said, 'Why won’t you take it?' He said: 'It's a family matter, it’s none of the public's business.'"

Twitter used the social media platform to address the rumors, mostly mocking the "Keeping Up with the Kardashian" star.

One user wrote, "When does Khloe testify at her dad's parole hearing?" Another added, "@khloekardashian are you watching your father's parole hearing?" A third user tweeted, "And next week on Keeping up with the Kardashians... We make amends with Khloe's Father Orenthal James Simpson."

Follow me on Twitter @dory_jackson