Texas high court halts the execution of a man whose conviction was tied to shaken baby syndrome diagnosis. Supporters say it was based on outdated science.

In yet another 11th-hour development in the case of death row inmate Robert Roberson, a splintered Texas Court of Criminal Appeals struck down a lower court’s order halting his execution in a late-night ruling Thursday.

The stay came mere hours before Robert Roberson was poised to become the first person in the U.S. executed for a murder conviction linked to shaken baby syndrome.