CARSON CITY — A last-minute move by a former Reno pawn shop owner to block his sentencing for killing his wife and shooting their divorce judge was rejected Wednesday by the Nevada Supreme Court.

A few hours after Darren Mack’s petition was filed, the high court issued a brief order turning him down. That cleared the way for the sentencing scheduled for Thursday and Friday in Reno.

Justices said their intervention at this point isn’t warranted, adding that Mack, 46, ‘‘has a plain, speedy and adequate remedy at law by way of a direct appeal’’ of his conviction that can be filed after he’s sentenced.

Mack, represented by attorney William Routsis, filed the petition after District Court Judge Douglas Herndon refused to let him withdraw his pleas of guilty to murdering his wife, Charla, and the equivalent of no contest to attempted murder in the shooting of Family Court Judge Chuck Weller.

Under a plea deal on the murder count, Mack faces life in prison with the earliest possible parole after 20 years. He also faces two to 20 years for attempted murder. It’s up to Herndon to determine whether the sentences run at the same time or back-to-back.

In an emergency motion filed with Mack’s petition, Routsis said that without a stay of the sentencing ‘‘many years will likely elapse’’ before Mack can get any relief on his claims of ineffective representation from his first lawyers, David Chesnoff and Scott Freeman, who he fired following his Nov. 5 pleas.

In a 40-page petition accompanying the motion, Routsis asked for an order directing Herndon to let Mack withdraw the earlier pleas. The lawyer said that when Mack entered them he was ‘‘confused as to the nature of the pleas and what exactly he was admitting.’’

Routsis also said Mack wasn’t properly questioned by Herndon about his understanding of the constitutional rights he was giving up by entering the pleas.

Mack has claimed he acted in self defense in the June 2006 stabbing death of his wife. After the stabbing, authorities said he then drove to a downtown Reno parking garage and used a high-powered rifle to shoot Weller through the window of his third-floor chambers.

Mack fled to Mexico and was the target of an international manhunt before he telephoned the Washoe County district attorney and negotiated his surrender.