Stieg Larsson is a classic example. At least I discovered "The Girl With the Dragon Tattoo" before it became all the rage. The problem is, he up and died. The nerve. He wrote 3 books I loved, and died. RIP Stieg Larsson.
Again I find myself thoroughly enjoying a different set of books and just discovered the author died three months ago. These are the medical forensic books placed in 12th century England written by Diana Norman under the pen name of Ariana Franklin. Fortunately Ms. Norman was 77 when she died and had a long life, as opposed to Mr. Larsson. Unfortunately for me, I'll never have the joy of reading more of her "Mistress of Death Series."