By David Schwartz and Karen Brooks
(Reuters) - An Arizona man convicted of strangling and stabbing his adoptive mother was executed by lethal injection on Wednesday, hours before a Texas man who confessed to being the ringleader of a ruthless band of murderers was due to be put to death.
Robert Henry Moormann, 63, was pronounced dead at 10:33 a.m. local time at the state prison complex in Florence, about 60 miles southeast of Phoenix, state officials said.
George Rivas, 41, is scheduled to be put to death at a prison in Huntsville, Texas sometime after 6 p.m. local time.
Moormann was serving a sentence of nine years to life at the Florence prison for kidnapping an 8-year-old girl when he was given a compassionate three-day furlough in January 1984 to visit with his mother.
Authorities said Moormann bound and gagged the 74-year-old woman at the motel where she was staying, before he strangled and stabbed her. He later chopped the body up and disposed of the parts in dumpsters throughout Florence.
With his last words, Moormann apologized to the family of the kidnap victim, saying "I'm sorry for the pain I caused them," according to prison department spokesman Bill Lamoreaux. "I hope this will bring closure and start the healing now. And I hope they will forgive me in time. And that's it."
His final meal consisted of a hamburger, French fries, two beef burritos, three sodas and ice cream, Lamoreaux said.
Moormann was convicted of first-degree murder on April 4, 1985 after a jury rejected his insanity defense. Jurors took two hours to reach a verdict.
In a flurry of last-minute appeals, defense attorneys sought to block the execution by claiming that the convicted murderer is mentally retarded and cannot legally be put to death.
Attorneys also objected to the state changing the drugs it uses for the execution, challenging the decision to switch to one drug from a three-drug protocol. The state Department of Corrections on Monday informed the Arizona Supreme Court of the change.
Moormann was the fifth inmate put to death in the United States this year.
In Texas, Rivas is scheduled to die for his role in the murder of police officer Aubrey Hawkins outside an Oshman's Superstore on Christmas Eve 2000 in Irving, next to Dallas.
Rivas was the confessed ringleader of a group that came to be known as the "Texas Seven," a band of convicted robbers, rapists, and murderers that broke out of a maximum security prison in Karnes County about an hour southeast of San Antonio on December 13, 2000.
At the time, Rivas was serving 17 life sentences for several crimes, including aggravated kidnapping, according to the Texas Attorney General's office.
After a series of robberies in other Texas cities, the group posed as security guards and shoppers and held up the Oshman's in Irving, killing Hawkins near the loading dock as they fled with more than $70,000 in cash, 44 firearms, ammunition, and other goods from the store, as well as employees' jewelry and wallets.
Following a nationwide manhunt, the fugitives were found in late January 2001 in Colorado.
Rivas, who was shot during the confrontation at Oshman's, later told reporters that he deserved to die for his crimes. In an interview published on Sunday in the Fort Worth Star-Telegram, Rivas said his appeals were exhausted and that he is ready to be executed.
One gang member, Larry Harper, committed suicide before he could be arrested. Another, Michael Rodriguez, was executed in 2008. The remaining four have all been convicted of capital murder and are on death row in Texas. Donald Newbury was scheduled to be executed earlier this month, but it was stayed pending the outcome of an unrelated Supreme Court case.
Rivas would be the second person executed this year in Texas, which executed 13 people in 2011 and has put to death more than four times as many people as any other state since the United States reinstated the death penalty in 1976, according to the Death Penalty Information Center.
Moormann was first inmate executed in Arizona this year and the 29th since the death penalty was reinstated there in 1992.
(Editing by Tim Gaynor, Greg McCune and Paul Thomasch)