I feel thick.  Thick with grief for someone I hardly knew.  Thick with sadness for his wife who now has to navigate this life without her partner.  Thick with from-the-gut-sorrow-and-distress at the thought of what those beautiful children are going through, will go through.

"Grief is like a mine shaft, narrow and deep." —Kenzaburo Oë

Rest in peace, M.  May your memory be a blessing.