1) Snow Cake - Alan Rickman
Rickman also played Severus Snape, one of the most fascinating characters in the Harry Potter series but his work in this little indie Snow Cake is among my favorites. He plays a man who goes to report the death of a woman he just met to her mother, who has autism and forms an interesting relationship with her.
2) Like Crazy - Anton Yelchin
Narrowing down a Yelchin performance is difficult. I think my favorite film he's been in is Alpha Dog, but I wanted to pick a performance where he's the lead, and he was spectacular in Like Crazy.
3) The Empire Strikes Back - Carrie Fisher
I know it's rather typical to pick a Star Wars movie for Fisher, but Empire Strikes Back is still the best Star Wars movie out there and I count it among my favorite films of all time.
I really wish I didn't have to write this post at all. I wish these wonderful actors were still with us.