My deepest condoloences to you and your family. I knew Mark only for a short time in the 6th grade and part of 7th. He was a wonderful person, kind, very intelligent, and friendly. I also grew up and went to high school with Bernard "Buddy" Weissman.
My thoughts and prayers are with you during this tragic time. What a horrible loss. The world will be a lonlier place without him. God Bless You.