The Texas Board of Pardons and Paroles has denied clemency for Robert Roberson, who is facing execution for the 2002 death of his daughter, Nikki Curtis, in a case linked to shaken baby syndrome. Roberson, 57, has long maintained his innocence, asserting that his daughter died from natural causes rather than abuse. His execution is scheduled for Thursday, and his legal team is urging Governor Greg Abbott to grant a 30-day reprieve to review new medical evidence. Despite bipartisan efforts, including support from Texas GOP megadonor Doug Deason, the board's unanimous decision is a significant setback for Roberson's case. Abbott can only grant clemency with a board recommendation, and he has historically intervened infrequently. The case has raised concerns about the reliability of scientific evidence in criminal convictions, as highlighted by some lawmakers and advocates.