This is truly sad news.

He was my favorite "sparring partner."
Mark and I seldom agreed on anything, and our discussions occasionally became a little heated. However, I never felt any ill will towards him and truly enjoyed our conversations. It gave me a chance to see the man behind the name, and I grew to love him as much as his closest friends loved him. He was a good man, and he'll be missed.
Rest in peace, ((Mark))