Although I'm unaware of the cause or circumstances of Mark's death, I want to express that I know he would be carrying on like all of us do, with a life and things we need to accomplish.  Mark didn't live until he was even 60.  Many of us are denied that accomplishment.  He must have had family and friends who love and who miss him.  Cherish life, love with abandon, laugh with a friend, reach out and keep in touch.  You may bring the smile and contentment that is all the difference to someone.  God bless and keep you, Mark.