God, it's been three years. Catch the mastermind. No problem. It was the murderer who was stabbed to death with a knife. Why are you looking for the mastermind? Since there is a murderer, we can sue. Now that the police have a murderer, whether it is him or not, there is no need to call the police. You've already killed someone. This is definitely a criminal responsibility, not a civil responsibility. Why do you care about the police?
Why not ask a professional lawyer? It's been three years. Ask online. . . As long as the court is in session, if you are dissatisfied, you can go to the High Court. Is that you have to be in the same place with the police without spending anything. I don't believe that the man who hacked your father can be eaten by the court and the police, in that case. . . It's really hard in China.