The U.S. Supreme Court declined Tuesday to stop the scheduled execution Larry Matthew Puckett.
Puckett is scheduled to die by lethal injection at 6 p.m. Tuesday for the sexual assault and slaying of a Forrest County woman.
Puckett was convicted in the 1995 death of Rhonda Hatten Griffis, a 28-year-old mother of two. He was 18 at the time.
Puckett spent Tuesday visiting with relatives. He requested a last meal of Macadamia nut pancakes, shrimp and grits, ice cream cake, caramel candy and root beer.
Thousands have signed an online petition in support of Puckett, insisting he is innocent.
Puckett's supporters hope to persuade Gov. Phil Bryant to stop the execution.
Puckett has requested that his body be released to his mother, Mary Puckett.
Meanwhile, death row inmate, William Mitchell, has asked the U.S. Supreme Court to stop his execution set for Thursday.
In documents filed Tuesday with the court, Mitchell says his previous attorneys didn't do a good job and the Mississippi courts have refused to give him a hearing and an expert to prove his "intellectual disability."
Mitchell, now 61, had been out of prison on parole for less than a year for a 1975 murder when he was charged with raping and killing 38-year-old Patty Milliken. Milliken disappeared on Nov. 21, 1995, after walking out of the Majik Mart convenience store where she worked in Biloxi to have a cigarette with Mitchell. Her body was found the next day under a bridge.