Brittney Murphy died but why?

The actress recently has died of going into cardiac arrest and she was only 32. I am someone who is all about staying healthy and wanting to live a long life. I eat healthy and I workout.
What can I do to prevent this from happening to my heart as of now and in the future?
What exactly does a person need to do in order to not have this horrible condition stuck in their life time? What are they symptoms/warning sighs?

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