Davis died by lethal injection on Wednesday for the shooting of off-duty policeman Mark MacPhail, who was aiding a homeless man in a Burger King parking lot at the time of his death.
Many other stars have also leant their support to Davis's campaign, including Lindsay Lohan, John Legend, Samantha Ronson and Mia Farrow.
P. Diddy even gave out a number for United States Attorney General Eric Holder to his Twitter followers, adding: "Urge him to intercede on Troy Davis - retweet to the world and call right now! (sic)"
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