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From what I read on a brief news snippet on Bob Blackwell's FB page was that Mark was attempting to save a friend while swimming and drowned. I share my sincere condolences with everyone. I have met him when my kids made Jr dragster exhibition runs at a National a few years ago, and he fist pumped each one before their run. A sincere gentleman in my opinion.
I am also in tears that he is gone. A very good man doing what he loved so that we could do what we love.