Whenever an application for exercise of the pardon authority is filed with the secretary of the Board of Pardons by a committed offender who is under a sentence of death, the sentence shall not be carried out until the board rules upon such application. If the board denies the relief requested it may set the time and date of execution and refuse to accept for filing further applications from such offender.
Neb. Rev. Stat. §§ 83-1,132