According to SF Signal, author Lucius Shepard has died at the age of 66.
I did not know Shepard personally, but he was one hell of a writer. He was a writer of novels, short fiction, and non fiction, and all of it was excellent.
Depending on one's perspective, he may be best known for his Dragon Griaule stories. I can't say that I have exhaustively read Shepard's work, but everything that I had encountered was compelling work.
The Best of Lucius Shepard
Two Trains Running
A Handbook of American Prayer