The longest lived stars, red dwards, will most likely simply fizzle out like a hot plate you turned off. It is unlikely we will ever observe such an event. Eve

The longest lived stars, red dwards, will most likely simply fizzle out like a hot plate you turned off. It is unlikely we will ever observe such an event. Even our Sun doesn't go Supernova, it just blows up a bit and discards it's outer layers, forming a white dwarf. The stars that go Supernova are much more massive (around 3 times, IIRC) and have orders of magnitude shorter lifetimes (measured in only a few hundred million years at best).