Andy Hallett died of heart failure - he was only 33! :(
with The Master:
He was easily one of the best characters on Buffy OR Angel! He was hysterical and he will be missed.
This is the best video I could find (that I liked) on short notice:
Click to view
He had so many GREAT scenes... I'm so sad he's passed away :( :( I was hoping to see him in something soon... *sigh* Poor Andy. He was such a great member of the fandom and seemed to take pride in his role as Lorne (and his participation in the Whedonverse) - I've never heard anything bad about him when fans meet him. He seemed to be a really nice guy. This is just horrible.
RIP Andy
http://www.eonline.com/uberblog/watch_with_kristin/b106789_angel_star_andy_hallett_dies_of_heart.html