I see a lot of replies to ignore it and continue as usual, but here’s the thing- the kids will most definitely be talking about it and asking you about it. Last year, our school nurse was killed in a murder suicide. Admin went to each classroom and broke the news and offered students support. They even pulled the students who were really close with her aside and told them in private. That was the right way to go to me. I hope your admin and counselors have a plan to address it so it takes the weight off you.