Updates on Sara's life

Here we go again...Our adult dolphin, Rio, died yesterday. We have no idea how it happened. She was perfectly fine on Sunday. On Monday she didn't eat anything, which is strange for Rio. We were doing overnight watches last night so we could keep our eye on her. At around 9:00 pm she started having trouble breathing. When I got there and in the water with Rio and the other trainers, she had taken her last breath and her heart stopped. I was able to go to the necropsy (animal autopsy), but they couldn't find anything. Everything looked completely normal. It's very frustrating. I can't believe we have to go through this again. Why? Why? Why? I'm still in shock.