Granted his wife was distraught when she wrote that, but semantically speaking if you get hit by a bus you don't know what you won't be able to say goodbye.
It sounds like it was either a terminal illness of some sort or his own decision, but frankly the cause is irrelevant. I never heard of him until today but it sounds like he was a good man and it's a shame for his family, friends and the community.
http://www.youtube.com/watch?v=k5c645Uexx0