I know what it feels like to lose someone like that so quickly. Last April my Mom..who was so full of life and love for her family and new husband suddenly got sick. Three weeks later we lost her to cancer. It is the ones left behind who suffer the pain for a long time.. And yes I had regrets too. Why didn't I show her my appreciation all of my life instead of waiting until she was ill? I'm still mad at myself for that.
I would like to say to his family, friends and colleagues.. "I'm sorry for your loss."