Death is a difficult subject for many people to deal with to deal with and some shy away from the word itself and resort to euphemisms when referring to the death of someone they know. Chris Raymond lists 101 alternatives for death, dead, or dying, some of which are jocular and used only for the deaths of strangers or people one dislikes.
Recently, I received the daily e-newsletter from my university and it reported the death of a former employee. The headline said that he had ‘passed away’, which is probably the most favored euphemism. But when I read the details, it appeared that he had died suddenly. To me the phrase ‘passed away’ signifies someone slipping into death, dying fairly peacefully and not unexpectedly, and its use to describe a sudden death seems incongruous.
Monty Python in the famous dead parrot sketch beginning at the 2:40 mark adds some other euphemisms.
I think that ‘gone to the fjords’ would be a pretty good euphemism too.
As a digression, here is John Cleese talking with Seth Meyers about the dead parrot sketch.