Music Legend Leslie West of Mountain Dies At 75 Leslie West, the towering guitarist who created the hard-rock milestone “Mississippi Queen” with his band Mountain, died Wednesday morning. West’s brother, Larry West Weinstein, confirmed the musician’s death to Rolling Stone. He was 75. The cause of death was cardiac arrest. On Monday, West was rushed to a hospital after suffering cardiac arrest at his home near Daytona, Florida, where he never regained consciousness.