(name) and I were more like brothers than business associates. We worked together on many projects and I have always had such high respect for him. We learned together, progressed together, and enjoyed life together. He was a great friend and I will miss seeing his...
Dear (recipient's name),
(name) and I were more like brothers than business associates. We worked together on many projects and I have always had such high respect for him. We learned together, progressed together, and enjoyed life together. He was a great friend and I will miss seeing his smiling face everyday.
Please accept my warmest sympathies at this difficult time.
Sincerely,
(your name)