Troy Davis' execution has been set for Wednesday night and the Georgia inmate's nephew, holding out hope that the condemned man will be granted a last-minute reprieve, has also expressed hope that his case will bring greater awareness to arguments against the death penalty.
"We've been praying about it and with God on our side anything can happen," said DeJaun Correia-Davis.
"Let this be a case that not only highlights the death penalty but will hopefully be a big part in bringing it to an end," Davis' 17-year-old nephew told hundreds at a rally in front of the Georgia Capitol Tuesday.
Davis' advocates have scheduled worldwide vigils and rallies, with Amnesty International and other groups planning to hold a rally outside the U.S. Embassy in Paris later Wednesday.
Other measures taken by supporters include asking prison workers to go on strike or to call in sick. Supporters have also appealed to the White House to step in and put a stop to Davis' scheduled execution.
It was also reported Wednesday morning that Davis had offered to undergo a polygraph test in an effort to prove his innocence.
The Georgia Board of Pardons and Paroles denied Davis' request for clemency Tuesday, a decision critics have called "unconscionable."
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Davis was found guilty of the 1989 killing of Mark MacPhail, a Savannah, Ga., police officer who was shot dead when he attempted to help a homeless man that was being attacked.
Davis' attorneys have argued that the conviction was based on flawed testimony, but prosecutors and relatives of the gunned down officer said they have no doubt the right man is being punished.
"Justice was finally served for my father," Mark MacPhail, Jr., who was an infant when his father was killed, told the Associated Press. "The truth was finally heard."
Davis is set to die by lethal injection Wednesday at 7 p.m. ET.