Police say that Simpson went to the hotel room on the pretext of brokering a deal with Beardsley and Fromong to buy the memorabilia. Fromong and Beardsley have said that the deal was arranged by Thomas Riccio, an auction-house owner, and that they didn't know that Simpson was one of the supposed buyers. Riccio recorded the confrontation and an earlier conversation he had with Simpson.
On the recording of his conversation with Simpson, a copy of which was obtained by ABC News, Simpson can be heard saying he wanted to recover his memorabilia in Nevada, away from the family of Ron Goldman, whom Simpson was accused of killing in 1994. Simpson was acquitted in the deaths of Goldman and Nicole Brown Simpson, but was ordered to pay about $38 million to their families in a wrongful death lawsuit, according to the Goldman family's attorney.
"I'm going to show up with a bunch of the boys, and take my [expletive] and they can't do nothing about it," Simpson says on the tape.
Riccio told ABC's Jim Avila that he had no idea guns would be present at the confrontation.
"There was no real plan. There was some memorabilia that belonged to him that was stolen and he was just gonna go pick it up," Riccio said.
"O.J. was gonna identify the items as being his, and tell 'em he wanted 'em back or we were gonna call the police."
But, according to police reports, Simpson and the other men burst into the room and the collectors were ordered at gunpoint to hand over several items, including football-game balls signed by Simpson, framed awards and baseballs autographed by Pete Rose, which they said were worth as much as $100,000.
Beardsley told police that one of the men with Simpson brandished a pistol and searched him.
"I'm a cop and you're lucky this ain't L.A. or you'd be dead," the man said, according to the report.
Simpson yelled at Beardsley, according to the report, saying, "I thought you were my friend," and "give me my s--t back."
"O.J. was enraged. He wasn't calm like he said he was gonna be," Riccio told ABC. "It was just a crazy scene and one of the guys took out a gun eventually."
Two defendants Walter Alexander, 46, and Clarence Stewart, 53, were arrested and released pending court appearances. A fourth suspect, Michael McClinton, 49, of Las Vegas, surrendered to police Tuesday. Alexander, Stewart, McClinton and Simpson were all charged with conspiracy to commit kidnapping, conspiracy to commit robbery, kidnapping with a deadly weapon, burglary with a deadly weapon, robbery with a deadly weapon, assault with a deadly weapon, coercion with a deadly weapon and conspiracy to commit a crime.
Police were seeking two other unidentified accomplices.
A hearing in Simpson's case was scheduled for the week of Oct. 22, though Galanter said he didn't expect the case to go to trial until next year.
With reporting by Chris Francescani in Las Vegas