Probably since no one will implicate anyone else the DA can't move forward with charges. I say sign the paper and get out, it's just a release from all consideration for the PD. Let's face it these guys weren't on a Sunday ride with their buddies and the cops swooped in and started harassing them. They killed each other, no innocent people were injured or killed, call it a wash and move on. No price on freedom, not even a million a second.