Something to note that the last post mentioned is that the police, this time, have Wagner caught in a lie by his own confession. Wagner inadvertently admitted to lying when he changed his story in his autobiography about what happened that night, whether he realized it, or not.
You can call into question his character, and his testimony, based on evidence that he falsified information to the authorities in the investigation to, for lack of a competing theory, avoid being a possible murder suspect. This is in reference to the wine bottle incident, and the details of the argument with Walken that were not disclosed. I don't remember exactly what his sworn statement was (really wish I had the police report,) but a lie is a lie, and it makes a person less credible, and more importantly, provides a motive to hide something.
Hindrance of the law is not something you want to be on the wrong end of, especially when its murder, and you could have diverted yourself from being a prime suspect with drunken jealously and rage as a motive for murder 2, manslaughter, or negligent homicide.