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Oklahoma's Richard Glossip is nun's 7th 'dead man walking'

Richard Glossip is scheduled to die by lethal injection despite pleas from Sister Helen Prejean and actress Susan Sarandon for a last-minute reprieve.

Sister Helen Prejean, best known as the "Dead Man Walking" nun, has accompanied six prisoners to their executions — and barring what she concedes would be a "miracle," she'll make her seventh trip on Wednesday.

Richard Glossip, who has been on death row for 18 years, is scheduled to die by lethal injection at 3 p.m. CT in Oklahoma despite pleas from Prejean, football coach Barry Switzer and actress Susan Sarandon for a last-minute reprieve.

"I don't think anybody should be put to death by the state but it just seems so glaring in his case," Prejean said.

Glossip reached out to the nun in January, a few weeks before his last execution date. That was delayed after the U.S. Supreme Court took up his challenge to the particular combination of drugs that Oklahoma uses to kill inmates.

RELATED: Sarandon: Oklahoma should not execute Richard Glossip

The high court eventually sided with the state, and Glossip's more recent appeals, which argue he is actually innocent of orchestrating the murder of his boss, have been rejected by the courts.

Prejean, who runs the Ministry Against the Death Penalty out of Louisiana, was in Oklahoma on Tuesday to prepare for what was looking more inevitable as the hours passed. She planned to visit Glossip at the Oklahoma State Penitentiary in McAlester and stay with him until 9 p.m, and then return Wednesday prior to his scheduled execution.

"We're going to talk and I'll be with him just to help him be poised that tomorrow at 3 p.m., he may die," she said. "He feels that even if he is killed, he has shown how broken this whole system of death is."

"He feels that even if he is killed, he has shown how broken this whole system of death is."'

Prosecutors have portrayed Glossip as a calculating killer who tried to cover up a $6,000 embezzlement because by convincing a maintenance man, Justin Sneed, to kill their boss, hotel owner Barry van Treese, in January 1997. He then helped Sneed cover up the brutal bludgeoning and lied to investigators, authorities say.

Glossip's original conviction was overturned because of deficiencies in his defense, but he was found guilty and sentenced to death in a 2004 retrial.

"I don't have a doubt in my mind that the state of Oklahoma has done their part," said the victim's son, Daniel Van Treese, who plans to attend the execution with two siblings.

Glossip's defenders note the case hinged on the testimony of Sneed, who cut a deal that allowed him to avoid the death penalty despite admitting he was the one who beat Van Treese to death with a bat. They say Sneed has given contradictory accounts and his own daughter endorsed clemency for Glossip.

Oklahoma County District Attorney David Prater said on Monday that he hasn't seen any new evidence that suggests Glossip isn't guilty and took a swipe at the prisoner's bold-faced backers.

"This is crap. This is a bull---- PR campaign, that's all it is," Prater said.

Van Treese said he has little patience for those fighting to save Glossip's life. "It's people who have more money than sense," he said. "They're using him to push their goals."

He said that after years of appeals and delays, his family is ready to put Richard Glossip behind them.

"It's going to allow us to have a little bit of closure," he said of the execution. "Let us get on with our lives."

Prejean said that if it comes to pass, Wednesday will be difficult for her, too. She has not walked a man to his execution since 2004.

"I am doing everything for him I can, to try to be with him in those final moments of terror," she said.

"Once they are over on the other side, I know they are in a realm where they cannot be touched and cannot be suffering. I believe if Richard does go, he is going to make it over with grace."

This article first appeared at NBCNews.com