I'm not sure it could go to a jury trial. With Murphy's body missing, there's no physical evidence remaining to link Rudolph to the crime. No proof of her death, no forensic autopsy, no ballistics, nothing but one person's uncorroborated testimony. (If I remember correctly, Butters and Sanya showed up after the shot was fired, so they couldn't testify they saw Rudolph fire his gun.) With the power out, any nearby security cameras wouldn't be functional, unless they had a battery backup... but that assumes they didn't get blown out again by the magic unleashed in the battle against the giant.
And Harry was already under investigation for the robbery at Marcone's vault, by Rudolph. The defense attorney would have a field day discrediting Harry with that information.
As much as I'd like to see Rudolph up on murder charges, I don't see any realistic way for it to happen. (Though I love the image of Toot on the witness stand... 😆) The karma bus is bound to catch up with him somehow, but I don't think it will happen through the mortal justice system.