That's right, the DA failed to prove his case.
Blake wasn't your normal stoooopid criminal. He had several years to study the perfect crime. Wearing gloves was a no brainer. Throwing the gun in the nearest dumpster got rid of the eveidence pronto. He had an alibi for all but about 11 minutes, I believe. To convict, you would have to say he was the only one that could have done it in the 11 minutes. Otherwise, there was no evidence to convict. Even OJ did pretty good, but he left DNA at the scene. Of course, everyone has DNA. LOL.