The Supreme Court has denied an appeal — without comment — by Texas death row prisoner Robert Roberson, who has always maintained his innocence. Roberson was convicted in 2003 of murdering his 2-year-old daughter; his lawyers say he was convicted on the basis of testimony by forensic experts who cited the “shaken baby syndrome hypothesis,” which was popularized in the early 2000s but never scientifically validated. Last month, a New Jersey appeals court ruled the theory is “junk science.”