Updated

LAS VEGAS (AP) — O.J. Simpson's lawyers have asked a Nevada Supreme Court panel to overturn the imprisoned former football star's conviction in an armed 2007 hotel room heist and grant a new trial.

Attorneys for Simpson and convicted co-defendant Clarence "C.J." Stewart argued Friday that neither man got a fair trial before they were convicted of robbing two sports memorabilia dealers of what Simpson claimed were his own belongings.

They say Simpson's acquittal in the 1994 slayings of his ex-wife and her friend in Los Angeles tainted the Las Vegas case.

Clark County District Attorney David Roger argues the Las Vegas trial was fair, and the verdicts were just.

A ruling is expected later this year.

Simpson is serving a sentence of nine to 33 years. Stewart is serving 7½ to 27 years.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

LAS VEGAS (AP) — One of O.J. Simpson's lawyers says the former football star is "upbeat" and hopeful the Nevada Supreme Court will overturn his conviction and grant a new trial in a September 2007 hotel room heist.

Simpson lawyer Malcolm LaVergne (la-VERN') says he visited Simpson last week at a state prison in the northern Nevada town of Lovelock.

He says Simpson knows the arguments being made Friday before three state high court justices in Las Vegas, and understands how important they are.

The attorney representing convicted co-defendant Clarence "C.J." Stewart says Stewart is "strong and very optimistic."

Simpson is serving nine to 33 years, while Stewart is serving 7 1/2 to 27 years.

A ruling from the court is expected later this year.

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Watch the proceedings: www.nevadajudiciary.us.

Cable network In Session, on TruTV, will also broadcast the 10 a.m. and 10:30 a.m. arguments.