The US Supreme Court announced late Wednesday that they have rejected an appeal on Troy Davis' behalf to have his execution stayed.

Earlier in the day, Davis lost an appeal at the Georgia Supreme Court in an attempt to have the execution stayed. Davis had also offered to submit to a lie detector test, but that request was denied.

The 42-year-old Davis was convicted of killing police officer Mark MacPhail in Savannah, Georgia in 1989. On Tuesday, he was denied clemency, despite the fact that some of eyewitnesses in the case have seven of the nine eyewitnesses recanted their testimony since his conviction, and also because no physical evidence or the murder weapon were found. There have also been reports of police misconduct in the case.

Davis has insisted on his insistence, and his execution has been stayed three times in the past four years. His bid for clemency has garnered much attention and support recently, with the movement to stop his execution being supported by high-profile public figures, including former President Jimmy Carter, Pope Benedict XVI and former FBI director William Sessions.

Supporters of Davis gathered in Georgia and as far away as London and Paris to protest his execution. About 100 people also protested outside of the White House. ABC News reporter Jake Tapper tweeted that the White House would not comment on the case: "WH declines to comment on Troy Davis case: 'it is not appropriate for the President of the United States to weigh in on specific cases'" the tweet said.

Amnesty International also said they collected nearly 1 million signatures on Davis' behalf.