I was at a CA at an assembly hall in Central CA when an older brother was on stage with others to give his experience. If I remember it was just after lunch. His chest suddenly started heaving, he was in the throes of a heart attack. The talk stopped, and then the speaker asked that some music be started. Everyone sat there watching as he was being worked on, even as the EMT's came onto the stage. After he was taken away, the meeting resumed. An announcement was made at the end that he had passed away. I can still see his daughter stand up and hear her cry out "Daddy!".
I think in this situation it was handled the best way possible.