Tony Hillerman
Sharlene introduced me to his books a few years ago and I've devoured them all. They are set (for the most part) on the Navajo reservation and tell the story of two tribal policemen. But they are so much more than that and when you read them you really feel that you start to know about the Navajo culture.
I was incredibly sad to hear of his death even though I knew he has been very ill for some time now.
R.I.P. Tony