The document was filed Monday by six experts and the American Association on Intellectual and Developmental Disabilities. It supports a request filed last month by Warren Hill's lawyers asking the high court to intervene.
Hill's lawyers in February presented statements from three doctors who had testified in 2000 that Hill wasn't mentally disabled and now believe he is. In the new court filing, the experts urge the high court to ensure that new testimony those experts be considered.
The execution of mentally disabled offenders is prohibited by state law and a 2002 U.S. Supreme Court decision.
Copyright 2013 The Associated Press.