For example, a band like Joy Division. Two masterpiece albums in the form of Unknown Pleasures and Closer, and the untimely death of Ian Curtis cut it all short. They were even heading into the direction that New Order eventually went in, and it would have been interesting to see what Ian Curtis would have done if they fully made the leap into electronic music while he was still alive.
The death of Mark Sandman (such a great name) on stage, 24 years ago, brought an end to Morphine. No other band can match the imagery and atmosphere of Noir as well as they could. You could also feel the evolution of their sound from their last album The Night.