The Texas Board of Pardons and Parole’s six members voted unanimously to deny the request. The decision came as lawmakers raised concerns that the courts were not properly implementing a groundbreaking 2013 “junk science” law that was intended to provide justice to people convicted based on scientific evidence that has since changed or been debunked.

Roberson is scheduled to receive a lethal injection Thursday evening for the 2002 killing of his 2-year-old daughter.

The clemency petition filed Sept. 17 asked for Roberson’s death sentence to be commuted, or the execution delayed 180 days to allow the board and Gov.