Transcript for Tim O'Brien on Herrera v Collins
-- -- -- -- is on death row in Texas for murdering two police officers but evidence that came to light eight years after his trial. Suggested may have been -- out of brother -- who committed the crimes. -- is now dead but his lawyer says he confessed so he told me himself that he committed these murders. And rolls on stated under oath that he watched as his father or not -- NL killed the officers. Wally evidence may not be conclusive -- -- attorneys asked that it be considered by the court but it was too late. In Texas new evidence must be presented to the trial judge within thirty days of the conviction. And today the Supreme Court ruled -- such time limits common in most states do not violate the constitution. Chief Justice William Rehnquist for a five justice majority -- -- defendant has been afforded a fair trial and convicted the presumption of innocence disappears. For new evidence to be considered the inmate may always seek clemency from the State's governor. Not sufficient said an angry Harry Blackmun for three dissenting justices the execution of a person who can show he is innocent comes perilously close to simple murder. The contemplate the the thing we don't like to even imagine. We will see people who -- correct skated. The ruling is consistent however with a series of death penalty decisions limiting the drawn out appeals process. That is frustrated prosecutors and relatives of victims. It's -- hurt that that's deep down you know it is just being carried on and on and on and on. -- win re going to be able to put -- cover on that hurt and just cooler. Today did a current Seles got an answer the -- the jury says killed her brother may now be executed unless the State's governor intervenes. Tim O'Brien ABC news Washington.
This transcript has been automatically generated and may not be 100% accurate.