Science fiction and fantasy author Ursula K. Le Guin, author of ?The Left Hand of Darkness? and the Earthsea series, died in her home in Portland, Oregon, her son said on Tuesday. She was 88. The cause of death on Monday afternoon is not clear, but she likely had a heart attack. She had been having health issues related to her heart in recent months. Le Guin was the author of 20 novels, six volumes of poetry, 13 books for children, many short stories as well as literary criticism.