So sad to hear this news. He was a fantastic actor, and I can't even imagine the amount of stamina and determination he possessed to be able to bring Nicholas Nickleby to life.
He created the part - eight and a half hours on stage, and Nicholas is in just about every single scene! Tons of dialogue and action, and with Dickens there's so much emotion that it had to be exhausting, but he did it. I'm not sure it could ever be done again!
He was the consummate Nicholas, never slipping into hamminess or camp but giving the character a fierce anger that gave him depth and helped the audience push through the Victorian trappings and see Nicholas as an everyman worth cheering for.
If you've never seen the show, I think all of it is available on YouTube. Definitely hunt it down. The entire cast is superb, but you'll never take your eyes off Rees. I couldn't!
And from everything I've heard, he was a real sweetheart of a guy to boot. We were lucky he shared his talent and his humanity with us!
And I'm pretty sure when he got up to heaven he got a hearty handshake from Dickens himself, and they're probably having a fantastic conversation right about now...