O.J. Simpson has begun testifying before a Nevada judge in his bid for a new trial in the Las Vegas armed robbery and kidnap case that put him in prison more than four years ago.

LAS VEGAS -- Appearing confident but sometimes emotional, O.J. Simpson testified Wednesday that he did not know guns were involved in a confrontation with sports memorabilia dealers that led to his conviction for armed robbery and kidnapping, and a sentence that could keep him behind bars for life.

Simpson, in shackles that rattled when he shifted in his seat, took the stand in a hearing on his bid for a new trial on grounds he wasn't properly represented by his trial attorney.

The 65-year-old former football star and actor, dressed in a drab prison uniform and now with short graying hair and a receding hairline, spoke clearly as he recounted events leading up to the 2007 incident in a Las Vegas hotel room where the dealers had Simpson footballs and family photos.

“There was no talk of guns at all,” he said under questioning by Patricia Palm, one of his attorneys.

During the trial, two co-defendants, who took plea deals and testified for the prosecution, said they had guns.

Simpson's voice cracked a bit as he recounted recognizing items on the hotel room bed, including framed photos that used to hang on the wall of his Los Angeles home.

“Look at this stuff. Some of the stuff I didn't really realize was gone. These were things I hadn't seen in 10 years,” he said. “You know, you get a little emotional about it.”

Simpson told his attorney that he believed he was allowed to take the items.

During the 2008 trial, Simpson was near tears as he told a judge: “I didn't mean to steal anything from anybody. ... I'm sorry. I'm sorry for all of it.”

There is no jury this time, and his fate will be determined by Clark County District Judge Linda Marie Bell.

In the hearing, Simpson was also asked about his background with his main trial attorney, Yale Galanter.

“Yale had a good relationship with the media,” Simpson said.

“I was in the media a lot. He was able to refute many of the tabloid stories,” Simpson said with a laugh. “He sort of liked doing it; he told me he did.”

Unlike previous days of the hearing, the courtroom was full, with Tracy Baker, daughter of Simpson sister Shirley Baker, and Charles Durio, husband of Simpson's deceased sister, Carmelita, in attendance. Also on hand was Tom Scotto, a Simpson friend from Miami whose wedding brought Simpson to Las Vegas.

A bailiff turned a number of people away, sending more than 15 to an overflow room where video was streamed live.

When he went to trial in 2008, Simpson did not testify -- a decision that one of his lawyers said was pushed on him by Galanter.

With 19 points raised to support his requested reversal in the writ of habeas corpus, Simpson was expected to answer many questions from his lawyers and then undergo cross-examination by an attorney for the state who is arguing the case to keep him in prison.

Simpson is serving nine to 33 years in prison for his conviction on armed robbery, kidnapping and other charges.

Earlier in the hearing, attorney Gabriel Grasso was Simpson's star witness. The Las Vegas lawyer said joined the original case when his old friend, Galanter, called and said, “Hey, Gabe, want to be famous?”

He said he soon realized he would be doing most of the behind-the-scenes work while Galanter made the decisions.