The family of Ron Goldman on Saturday defended publishing a book that they believe is former football star O.J. Simpson's confession to the murder.

“It was very disturbing and bothersome to me to read the words of the man that murdered my son,” Fred Goldman, father of Ron Goldman, told FOX News. "These are his words. We can take his words and show him to be the monster that he is."

The Goldmans recently published "If I Did It: Confessions of the Killer," after a Florida bankruptcy court awarded them the rights in August 2007 in connection to an unpaid civil judgment they won in their wrongful death suit against Simpson. HarperCollins, the book's original publisher, canceled publication after the contents of the book drew harsh criticism. The book, published now by Beaufort Books, includes a chapter in which Simpson discusses how he— hypothetically— would have killed his ex-wife, Nicole Brown Simpson and Goldman.

Simpson was acquitted of the 1994 murder of Brown Simpson and her friend Ron Goldman.

"He (Simpson) wrote this. This is his way of telling the world how he did it," Kim Goldman, Ron Goldman's sister, told FOX News.

The book remained at the top of Amazon.com best sellers on Saturday.

Click here to read the FOX411: Author Says He Was Told O.J. Book Was Confession

Click here to read Part 2 of today's FOX411: Book Shows How O.J. Killed, or Didn't Kill, Nicole and Ron

Meanwhile, O.J. Simpson is under investigation in an alleged armed robbery at a casino hotel room involving his sports memorabilia.

Simpson told The Associated Press on Friday that he hoped to recover items stolen from him by going to the room. Simpson also said no guns were involved.

"There was no armed robbery here," Simpson said in a telephone interview. "It wasn't a robbery. They said 'Take your stuff and go."'

The Goldmans called Simpson's bout with the police in Las Vegas "ridiculous."

"This recent situation in Vegas is just more of him trying to prove to the world that he can do anything he wants," Fred Goldman said.

The Associated Press contributed to this report.