The Supreme Court has ruled for a Texas death row inmate who's seeking DNA testing to show he should be ineligible for execution.

For nearly 15 years, a man on death row in Texas has sought DNA testing to try and prove he did not kill an 85-year-old woman.

Ruben Gutierrez is challenging the constitutionality of a state law that restricts death row inmates from seeking tests that he says will prove he’s not a murderer.