A man convicted in the 1980 killings of two people was scheduled to die Wednesday in what would be Arizona's third execution since it started carrying out the death penalty in May after a nearly eight-year hiatus.

Murray Hooper, 76, is scheduled to die by lethal injection at the state prison in Florence for his murder convictions in the killings of William "Pat" Redmond and his mother-in-law, Helen Phelps.

Authorities say the killings were carried out at the behest of a man who wanted to take over Redmond’s printing business.

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The courts rebuffed attempts by Hooper’s lawyers to postpone the execution and order fingerprint and DNA testing on evidence from the killings.

His lawyers said Hooper is innocent, that no physical evidence ties him to the killings and that testing could lead to identifying those responsible. They say Hooper was convicted before computerized fingerprint systems and DNA testing were available in criminal cases.

They also asked the U.S. Supreme Court to review his claim that authorities had until recently withheld that Redmond’s wife, Marilyn, who survived being shot in the head during the attack, had failed to identify him in a photo lineup. However, authorities say that claim is based on a mistake a prosecutor made in a letter to the state’s clemency board and now insist that no such lineup was shown to Marilyn Redmond.

Murray Hooper in AZ

An undated file photo shows Murray Hooper, who is sentenced to capital punishment in the 1980 killings of two people. (Arizona Department of Corrections, Rehabilitation and Reentry via AP, File)

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She later identified Hooper in an in-person lineup and testified against him at his trial.

Authorities say Hooper and two other men forced their way into the Redmond home on Dec. 31, 1980. The three victims were bound, gagged, robbed and shot in the head.

Two other men, William Bracy and Edward McCall, were convicted in the killings but died before their death sentences could be carried out.

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Authorities say Robert Cruz, who was alleged to have had ties to organized crime, hired Hooper, Bracy and McCall to kill Pat Redmond, who co-owned a printing business. They said Cruz wanted to take over the business and was unhappy that Redmond had rejected his offers to enter several printing contracts with Las Vegas hotels, according to court records. Cruz was acquitted of murder charges in both deaths in 1995.

Hooper’s lawyers say Marilyn Redmond’s description of the assailants changed several times before she identified their client, who said he was not in Arizona at the time. They also raised questions about the benefits received by witnesses who testified against Hooper, including favorable treatment in other criminal cases.

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Arizona did not carry out the death penalty for nearly eight years after criticism that a 2014 execution was botched and because it encountered difficulty obtaining lethal injection drugs. No other executions are currently scheduled in the state.

Arizona has 111 people on death row, 22 of whom have exhausted their appeals, according to the state attorney general’s office.