JACKSON, Ga. (AP) -- Georgia inmate Troy Davis has been executed for the killing of an off-duty police officer in a case that has drawn worldwide support over his claims of innocence.
Courts consistently ruled against him, however, and the officer's family says they finally have justice after 22 years.
Davis was pronounced dead at 11:08 p.m. Wednesday. He was put to death for the 1989 killing of Mark MacPhail. The officer was shot to death while rushing to help a homeless man being attacked by Davis and others.
Davis' global support came from high-profile advocates, including a former U.S. president, the pope and celebrities.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
The Supreme Court late Wednesday rejected an 11th-hour request to block the execution of Troy Davis, who convinced hundreds of thousands of people but not the justice system of his innocence in the murder of an off-duty police officer.
The court did not comment on its order, which came four hours after it received the request. Davis' execution had been set to begin at 7 p.m., but the high court's decision was not issued until after 10 p.m. The execution was to move forward, but state officials were not expected to make an announcement until after it was over.
Though Davis' attorneys say seven of nine key witnesses against him have disputed all or parts of their testimony, state and federal judges have repeatedly ruled against granting him a new trial. As the court losses piled up Wednesday, his offer to take a polygraph test was rejected and the pardons board refused to give him one more hearing.
Davis' supporters staged vigils in the U.S. and Europe, declaring "I am Troy Davis" on signs, T-shirts and the Internet. Some tried increasingly frenzied measures, urging prison workers to stay home and even posting a judge's phone number online, hoping people will press him to put a stop to the lethal injection. President Barack Obama deflected calls for him to get involved.
"They say death row; we say hell no!" protesters shouted outside the Jackson prison where Davis was to be executed. In Washington, a crowd outside the Supreme Court yelled the same chant.
The crowd outside the prison swelled to more than 500 as night fell and a few dozen riot police stood watch. The demonstrators turned quiet as word of the high court's decision spread, with some silently holding candles, some crying and several gathered around Davis' family.
Laura Moye of Amnesty International said the execution would be "the best argument for abolishing the death penalty."
"The state of Georgia is about to demonstrate why government can't be trusted with the power over life and death," she said.
About 10 counterdemonstrators also were outside the prison, showing support for the death penalty and the family of Mark MacPhail, the man Davis was convicted of killing in 1989.
"He had all the chances in the world," his mother, Anneliese MacPhail, said of Davis in a telephone interview. "It has got to come to an end."
At a Paris rally, many of the roughly 150 demonstrators carried signs emblazoned with Davis' face. "Everyone who looks a little bit at the case knows that there is too much doubt to execute him," Nicolas Krameyer of Amnesty International said at the protest.
Davis' execution has been stopped three times since 2007, but on Wednesday the 42-year-old ran out of legal options.
As his last hours ticked away, an upbeat and prayerful Davis turned down an offer for a special last meal as he met with friends, family and supporters.
"Troy Davis has impacted the world," his sister Martina Correia said at a news conference. "They say, `I am Troy Davis,' in languages he can't speak."
His attorney Stephen Marsh said Davis would have spent part of Wednesday taking a polygraph test if pardons officials had taken his offer seriously.
"He doesn't want to spend three hours away from his family on what could be the last day of his life if it won't make any difference," Marsh said.
Amnesty International says nearly 1 million people have signed a petition on Davis' behalf. His supporters include former President Jimmy Carter, Pope Benedict XVI, a former FBI director, the NAACP, several conservative figures and many celebrities, including hip-hop star Sean "P. Diddy" Combs.
"I'm trying to bring the word to the young people: There is too much doubt," rapper Big Boi, of the Atlanta-based group Outkast, said at a church near the prison.
The U.S. Supreme Court gave Davis an unusual opportunity to prove his innocence in a lower court last year, though the high court itself did not hear the merits of the case.
He was convicted in 1991 of killing MacPhail, who was working as a security guard at the time. MacPhail rushed to the aid of a homeless man who prosecutors said Davis was bashing with a handgun after asking him for a beer. Prosecutors said Davis had a smirk on his face as he shot the officer to death in a Burger King parking lot in Savannah.