Lynn D. “Buck” Compton, an Army paratrooper whose World War II service was portrayed in the book and HBO miniseries “Band of Brothers” and who later as a prosecutor secured a conviction of Robert F. Kennedy assassin Sirhan Sirhan, died Feb. 26 at his home in Burlington, Wash. He was 90. He had complications from a heart attack, said his daughter Syndee Compton. Mr. Compton retired in 1990 as a judge on the California Courts of Appeal.