Dock Ellis, the former major league pitcher best remembered for his flamboyance and social activism as a member of the great Pittsburgh Pirates teams of the 1970s, died Friday of a liver ailment in California, his former agent, Tom Reich, confirmed. Ellis was 63. Ellis spent 12 years in the majors with Pittsburgh, the New York Yankees, Oakland, Texas and the New York Mets. He retired in 1979 with a record of 138-119, but was best known for several colorful incidents on and off the field.