Using a wrongful death action just to get to depose PF to get information about the KB's death really wouldn't work. He can just invoke his 5th Amendment right against self-incrimination and not answer much. Even if he totally refused to cooperate, the court could only hold him in contempt and that doesn't really do much. Now, they could use the suit to gain access to the ranchette property for inspection or to get access to phone records, bank records, etc. But LE already has all of that. They could use the suit to depose other witnesses however, and force them to show up for questioning.