A lot of novels state that a person died with a smile on the face, or how relatives/friends notice a smile on the face that remains even after death.
Is such a thing anatomically possible? Will a smile or any other expression be retained by the muscles at/after death? (without external assistance from say a mortician)
And which expression is most common at death? (once skin and muscles die, after death, during rigor and after rigor passes, when undisturbed)