DOTLAN EveMaps

Luke dies! (Sort of)
In the final showdown with Kylo Ren, it is revealed that Luke isn't actually there. At least, not physically. He was simply projecting an image of himself from his island using the Force. It was all a ploy to buy the Resistance time to make their escape.

Despite this, after the battle, Luke looks off into the heavens and slowly disappears into the ether. Presumably, projecting a hologram across the galaxy expended too much Force. Another OT hero bites the dust.

Supreme Leader Snoke dies
We did not see this one coming. Supreme Leader Snoke is this trilogy's answer to Emperor Palpatine, so we were fully expecting him to stick around for the final act. Instead, he gets chopped in half by his protege Kylo Ren. We can't say we're sad to see him go - Snoke was one of the weakest aspects of The Force Awakens.

This does cause a bit of a villain vacuum though; neither Kylo Ren nor High Commander Hux are particularly formidable. Maybe the Knights Of Ren (former Jedi pupils turned to the Dark Side by Kylo) will supply the threat that Part IX sorely needs.

Phasma dies (again)
Gwendoline Christie's Phasma is pretty much wasted in this movie - just like she was in The Force Awakens. We do get to see approximately nine percent of her face before she kicks the bucket though.

Admiral Akbar dies
The "It's A Trap!" guy gets blown up off-screen in a First Order attack. Bummer.