The one person that hurt me the most, was my mother. When she was diagnosed with pancreatic cancer and she had only a few months to live, it was simply a matter-of-fact emotion. I went to see her in the hospital and care center (1 time each) but that was only more to support my siblings than her. When she died, I shed no tears. I didn't even waste effort or time on hating her. When she passed it was like an end of an era and I no longer had to be concerned with her. There was a sense of relief. There were to be no more upsets and false accusations and having to listen to her stories of hate and suspicions. I was free.
So, I guess I share my experience to encourage you to not hold yourself to any specific emotions toward your abuser. If you have some, fine, recognize it/them but don't feel obligated to take on others that are false. Funerals and death can be a time when influence by other's feelings, reactions, and expectations can make you want to "adopt" them for yourself so you "look" the part. Be aware. You are not obligated to feel any certain way over your abuser's death. If you have no reaction, let it be. But, do understand that you no longer have to deal with further threat from the guy. It is over. It is time to focus on you and your emotional healing.