I too am saddened by this news. I have seen him live a couple of times and enjoyed his music countless times. Speaks to our dark side he does, and yet always with the unspoken hope. I couldn't begin to count how many times I may have quoted his lyrics.
I'm sure he will find more dark and poignant things to say to us in his last days. I for one look forward to the balance of his work and wish him godspeed, all alone on the road to perfection.
... I'll sleep when I'm dead.