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By Tracy Connor

A death-row inmate who admitted killing and drinking the blood of a 12-year-old boy is set to be executed in Texas on Wednesday night.

The U.S. Supreme Court denied a stay of execution for Pablo Lucia Vasquez, 38, who was convicted of the 1998 murder of David Cardenas.

Vasquez's lawyers had argued that he should get a reprieve because jurors who were against the death penalty were excluded from his trial. In other appeals, Vasquez has argued that he was mentally ill.

This undated handout photo provided by the Texas Department of Criminal Justice shows Pablo Lucio Vasquez.Texas Dept. of Criminal Justice via AP file

Nicknamed the "Vampire" killer, Vasquez told police that he was hearing voices and instructions from the devil when he attacked the boy with a shovel after a party.

He bludgeoned the child, slit his throat, tried to remove his head and consumed his blood.

"Something just told me drink," he told police at the time.

The execution would be the sixth in Texas this year and the 11th nationwide.