Do you know any idiom that would be a counterpart of Russian "помер Никодим, ну и х*й с ним" (Nikodim has died and so be it [and nobody gives a s**t about it])? I came up with a Yoda-like verse "dead and gone cares no one" but I am looking for a real British saying if it exists.
I think the colloquial expression is dead and buried. It sort of implies forgotten.
We, perhaps, use it less for people, than in a metaphorical sense for things we are glad to see the back of.
By the time our Prime Minister arrives home from China the Hinckley Point project may be dead and buried.
This would mean that the speaker did not approve of the scheme and was hoping that the government would knock it on the head (another similar metaphor).
This does not, incidentally necessarily reflect my own view of the Hinckley Point project.
Possibly died in obscurity is closer to the intended meaning, although it is not exactly the same.