JACKSON, Ga. - Strapped to a gurney in Georgia's death chamber, Troy Davis lifted his head and declared one last time that he did not kill police officer Mark MacPhail. Just a few feet away behind a glass window, MacPhail's son and brother watched in silence.
Outside the prison, a crowd of more than 500 demonstrators cried, hugged, prayed and held candles. They represented hundreds of thousands of supporters worldwide who took up the anti-death penalty cause as Davis' final days ticked away.
"I am innocent," Davis said moments before he was executed Wednesday night. "All I can ask ... is that you look deeper into this case so that you really can finally see the truth. I ask my family and friends to continue to fight this fight."
Prosecutors and MacPhail's family said justice had finally been served.
"I'm kind of numb. I can't believe that it's really happened," MacPhail's mother, Anneliese MacPhail, said in a telephone interview from her home in Columbus, Ga. "All the feelings of relief and peace I've been waiting for all these years, they will come later. I certainly do want some peace."
She dismissed Davis' claims of innocence.
"He's been telling himself that for 22 years. You know how it is, he can talk himself into anything."
Davis was scheduled to die at 7 p.m., but the hour came and went as the U.S. Supreme Court apparently weighed the case. More than three hours later, the high court said it wouldn't intervene. The justices did not comment on their order rejecting Davis' request for a stay.
CBS News justice correspondent Jan Crawford reports that even the four liberal justices on the nation's highest court agreed - Davis had multiple chances to prove his innocence, and each time he failed.
Hundreds of thousands of people signed petitions on Davis' behalf and he had prominent supporters. His attorneys said seven of nine key witnesses against him disputed all or parts of their testimony, but state and federal judges repeatedly ruled against him three times on Wednesday alone.
Officer MacPhail's widow, Joan MacPhail-Harris, said it was "a time for healing for all families."
"I will grieve for the Davis family because now they're going to understand our pain and our hurt," she said in a telephone interview from Jackson. "My prayers go out to them. I have been praying for them all these years. And I pray there will be some peace along the way for them."
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 would 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 before Davis was executed. In Washington, a crowd outside the Supreme Court yelled the same chant.
As many as 700 demonstrators gathered outside the prison as a few dozen riot police stood watch, but the crowd thinned as the night wore on and the outcome became clear.
Davis' execution had been halted three times since 2007. The U.S. Supreme Court even gave Davis an unusual opportunity to prove his innocence in a lower court last year. While the nation's top court didn't hear the case, they did set a tough standard for Davis to exonerate himself, ruling that his attorneys must "clearly establish" Davis' innocence a higher bar to meet than prosecutors having to prove guilt. After the hearing, a lower court judge ruled in prosecutors' favor, and the justices didn't take up the case.
His attorney Stephen Marsh said Davis would have spent part of Wednesday taking a polygraph test if pardons officials had taken his offer seriously. But they, too, said they wouldn't reconsider their decision. Georgia's governor does not have the power to grant condemned inmates clemency.
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 before the execution. "They say, `I am Troy Davis,' in languages he can't speak."