I don't think there's any right or wrong way to react to the death of your abuser. It's bound to be mixed.

When I found out my childhood abuser had died, I was conflicted too. I was sad and glad at the same time. Finding out turned out to be a huge trigger for me and I spiraled down into depression before I finally got some help, both with the depression and dealing with the abuse after many years. So, even the results of his death are mixed for me. It caused some of the darkest times of my life, but also caused me to finally start working through what he did.