The buzz is that the infamously ill-tempered actor-turned-producer did the fatal deed on purpose. He was horribly jealous of how much attention his co-star received from the women in the cast, including the victim. This costar is a gentleman, so admiration was innocent. That made it even worse.
The costar has been crying for help at fan conventions. Diehard followers of his double-digit-running genre show have had a bad feeling about it. Don't fall for the decoy story about the costar's costume piece containing evidence. He already assured the police he knew armory safety protocols backwards and forwards, and his resume definitely checks out on that.
The actor-turned-producer's impression has gotten him too much pull. It has gone to his head. He already tried to monetize his own sympathy tour. The poor patsy who ended up serving time is destitute, on the last leg. Her only error was being an even bigger fan of this sweet, southern gentleman costar than the deceased foreign-born victim.