I'm so so sorry for your lose. I hate it when I hear of a life cut short, by such things. No person should have to go in that way.
My husband's mother died the same way,a few years back. The lose of a loved one is bad enough, but to go in this manner, is one of the worse.

Prayers are with you and his family. {{{{{{{{HUGS}}}}}}}

Focus on the good times, remember the love and be thankful for the gift of having such a wonderful friend, no matter how short it was.