REVEALED: O.J. Simpson describes the grisly murders of Nicole Brown Simpson and Ron Goldman

“It was horrible. It was absolutely horrible.”

In an upcoming interview to premiere on Sunday, convicted felon O.J. Simpson explained how he would have killed his former wife and her friend, had he really been the killer, which has eerie similarities to what a former pal wrote about the former NFL star in 2008.

Mike Gilbert, a former friend of Simpson’s, indicated that Simpson used Nicole Brown’s knife to murder her and her friend, Ron Goldman, in 1994, according to ESPN.

Gilbert, author of book, “How I Helped O.J. Get Away With Murder: The Shocking Inside Story of Violence, Loyalty, Regret and Remorse,” said that his Simpson admitted that he killed the pair, but claimed he didn’t mean to do it and simply blacked out. Gilbert wrote that Simpson indicated to him that he may have used a knife Brown had in her hand when he arrived to the home to confront her.

RELATED Reading: O.J. Simpson crime scene photos: **Warning** Graphic Images

“If she hadn’t opened that door with a knife in her hand … she’d still be alive,” Simpson reportedly told Gilbert. “Nothing more needed to be said. O.J. had confessed to me. There’s no doubt in my mind.”

FOX News reports  that while speaking in a 2006 interview, Simpson said he was angry with Brown for hanging out with a friend, Faye Resnick. Simpson said both his wife and Resnick were on drugs and he became enraged when he learned the pair were entering drug rehab together.

The interview, in which Simpson describes his hypothetical involvement in the infamous murder of Brown and Goldman, will be aired Sunday in the upcoming “O.J. Simpson: The Lost Confession” television special.

O.J. Simpson’s ex-wife Nicole Brown Simpson, left, and her friend Ron Goldman, both of whom were murdered and found dead in Los Angeles on June 12, 1994. (AP Photo/File)

With a pal named “Charlie,” (likely an alter ego, according to the special’s executive producer) Simpson said he drove to Brown’s Calabasas home to confront her. Expecting to see Nicole there with Faye Resnick, he instead saw her with Ron Goldman, who walked up to Simpson while he argued with Brown.

Simpson claimed Brown fell down during their argument, prompting Goldman to threaten to beat Simpson up with his “karate thing.”

“At that time, I think Charlie had followed this guy in, to make sure there was no problem, and he brought in the knife. I took the knife from Charlie, and to be honest, after that, I don’t remember, except I’m standing there and there’s all kinda stuff around. Blood and stuff.”

“It’s hard for me to describe it,” Simpson continued. “I didn’t think anybody could be murdered the way they were without everybody covered in blood. We’ve all seen the grisly pictures after. Everything was covered, would have been covered in blood… It was horrible. It was absolutely horrible.”

Gilbert, who appeared on a previous documentary, entitled, “OJ: Made In America,” claimed that he didn’t think Simpson simply blacked out. He felt Simpson went over to the home with planned intentions of murder, something that at first, Gilbert himself had a hard time believing.

“I believed that for the longest time and then I … He went there to kill her. He went there to kill her because of how she made him feel … rejected … like she didn’t need him.”

“O.J. Simpson: The Lost Confession,” a two-hour television special, will air on FOX at 8 p.m. EST, on Sunday night.

[Feature Photo: OJ Simpson via AP/Ethan Miller]