That being said, it is important to take precautions to prevent further incidents from happening. The best thing to do is to separate the pets involved as soon as possible, and make sure they are supervised when they are together.
It may also be helpful to seek advice from a veterinarian or animal behaviorist to understand what may have caused the incident and how to best respond. They can provide guidance on how to safely reintroduce the pets to each other, or recommend other solutions to prevent future incidents.
In addition to taking practical steps to ensure safety, it's important to give yourself and your family time to grieve and process the loss of your other pet. Losing a pet is never easy, and it's okay to feel sad and emotional. Surround yourself with loved ones, talk about your feelings, and be kind to yourself.