Sad news. Stuff like this does happen though. When I was in my thirties I was taking an Adult Ed. Woodshop class in night school at the local high school. I used to love to do lathe work, turning bowls, etc.. There was this one guy in the class who always made us nervous around any of the big shop equipment. One night he decided to use the lathe right next to mine. He didn't bolt his chunk of wood on well enough or center it for that matter. He turn the lathe on high speed touched the wood with his chisel, and sent it flying past my head into the wall where it hit with enough force to split the wood into bits, and dent the wall. Our instructor had a little sit down chat with him after that. Point is accidents happen, just never know when your ticket will be pulled.
Still sad to hear someone died at the races.