>> a supporter of cantu tried to block the camera minutes after the jury returned with their decision that cantu shex kuyted. >> district attorney sam milsap agreed with the jury's verdict. >> ruben cantu arguably received a perfect trial. i say that because he had a fair judge. he had a very fine defense lawyer. he had an ethical prosecutor. and the jury made the only decision that they could make under the circumstances. >> ruben's accomplice, a man named david garza, received 20 years. cantu was sent to solitary confinement at the huntsville state penitentiary, 230 miles east of san antonio. from his cell, ruben wrote a letter addressed to the citizens of san antonio. >> this was a letter he wrote not long after he was convicted.