Police arrested O.J. Simpson on Sunday, saying he was part of an armed group who burst into a Las Vegas hotel room and snatched memorabilia that documented his own sports career, long ago eclipsed by scandal.

The arrest starts a new legal odyssey for the fallen football star who more than a decade ago was acquitted of the slayings of his ex-wife and a friend, and opens the possibility he could spend decades behind bars.

Simpson was taken away from The Palms hotel-casino by plainclothes officers a day after the arrest of a golfing buddy who police say accompanied him with a gun in the Thursday night holdup. Handcuffed and wearing a golf shirt and jeans, Simpson was placed in an SUV.

"He was very cooperative, there were no issues," Capt. James Dillon said.

Simpson was at the Clark County Detention Center on Sunday night for booking on two counts of robbery with a deadly weapon, two counts of assault with a deadly weapon, conspiracy to commit a crime and burglary with a firearm, police said. The district attorney, meanwhile, said he expected Simpson to ultimately be charged with seven felonies and one gross misdemeanor.

A judge ordered Simpson be held without bail, said Sgt. John Loretto. A court date was set for Thursday.

Simpson attorney Yale Galanter told The Associated Press late Sunday that he would fight the charges vigorously.

"We believe it is an extremely defensible case based on conflicting witness statements, flip-flopping by witnesses and witnesses making deals with the government to flip," Galanter said.

If convicted of the booking charges, Simpson would face up to 30 years in state prison on each robbery count alone.

"He is facing a lot of time," said Clark County District Attorney David Roger.

Simpson, 60, has said he and other people were retrieving items that belonged to him. Simpson has said there were no guns involved and that he went to the room at the Palace Station casino only to get stolen mementos that included his Hall of Fame certificate and a picture of the running back with J. Edgar Hoover.

Simpson told The Associated Press on Saturday that he did not call the police to help reclaim the items because he has found the police unresponsive to him ever since his ex-wife, Nicole Brown Simpson, and her friend, Ron Goldman, were killed in 1994.

"The police, since my trouble, have not worked out for me," he said, noting that whenever he has called the police "It just becomes a story about O.J."

Police did not allege that Simpson personally carried a weapon in the incident.

"We don't have any information to lead us to believe he was armed even based on those charges," said police Lt. Clint Nichols.

Police said they seized two firearms involved in the robbery along with sports memorabilia, mostly signed by Simpson. They also said they recovered collectible baseballs and Joe Montana cleats at private residences early Sunday on three search warrants. But "whether or not the property belonged to Mr. Simpson is a matter of debate," Nichols said.

Walter Alexander, 46, of Mesa, Ariz., was arrested Saturday night on two counts of robbery with a deadly weapon, two counts of assault with a deadly weapon, conspiracy to commit robbery and burglary with a deadly weapon. Alexander, who was described as one of Simpson's golfing buddies, was released without bail Saturday night.

"Walter was one of the two subjects who had a gun," Capt. James Dillon said.

Robert Dennis Rentzer, a Los Angeles lawyer representing Alexander, said he was able to arrange his client's release from custody, but wasn't familiar with the allegations.

Police also are seeking four men: Las Vegas residents Clarence Stewart, 53, and Michael McClinton, 49; Tom Scotto, whose age and hometown were not known, and another man who was not identified.

Simpson, a Heisman Trophy winner, ex-NFL star and actor, lives near Miami and has been a tabloid staple since his ex-wife and Goldman were killed. Simpson was acquitted of murder charges, but a jury later held him liable for the killings in a wrongful death lawsuit.

Goldman's father, Fred Goldman, welcomed the possibility that Simpson could go to prison.

"He's believed for years, decades, that he's entitled to do anything he wants, and the legal system and society has basically agreed with him," Goldman said. "This time, hopefully, he'll get what he deserves. He'll get jail time."

Simpson said auction house owner Tom Riccio called him several weeks ago to say some collectors were selling some of his items. Riccio set up a meeting with collectors under the guise that he had a private collector interested in buying Simpson's items.

Simpson said he was accompanied by several men he met at a wedding cocktail party, and they took the collectibles.

"It's like a bad dream," Alfred Beardsley, one of the memorabilia collectors who was in the hotel room, said late Sunday. "I'm sad that O.J. is in custody."

Beardsley said he blames the whole thing on Riccio, who he claims told Simpson that his property was in the room in Las Vegas.

"If they don't charge Riccio I will be very upset. That guy lied to O.J. and got him all pumped up," he said.

Beardsley said the people that should be blamed are Riccio and Mike Gilbert, the former Simpson agent who he alleged stole memorabilia from Simpson.

Simpson's arrest came just days after the Goldman family published a book that Simpson had written under the title, "If I Did It" about how he would have committed the killings of his ex-wife and Goldman had he actually done it.

After a deal for Simpson to publish it fell through, a federal bankruptcy judge awarded the book's rights to the Goldman family, who retitled it "If I Did It: The Confessions of the Killer." During the weekend, the book was the hottest seller in the country, hitting No. 1 on Amazon.com and Barnes & Noble.com.