My cat died suddenly. She is about 18lbs and was laying on my desk which is about 2 and a half feet off the ground. She was laying down looking at me and all of a sudden as if something frightened her; she pushed herself off the desk onto the floor and did not land on her feet. She moved her feet frantically as if she was running. She made weird weezing noises as if trying to catch her breath. She was not blinking or moving her head, but her legs were moving initally and stopped. She maintained a heart beat a half minute or so after she stopped moving. What could of happened? She was only 6 years old. I was on my computer and I now feel guilty because I was going to go to bed earlier and she was up on my desk because of me. Please help me, I am really sad and looking for answers.