Besides not ever being allowed to fly again I would pressure the NTSB to file charges against him for filing false crash reports and charge him with manslaughter for the death of his passenger. 
This is beyond pilot error. Being overweight and flying a Ryan Navion, which is a low wing aircraft with poor visibility for "sightseeing" shows me that it wasn't about a safe and fun flight seeing trip as it was ripping off someone and not caring even about their safety or lives. Don't ever let him fly again.