Clara Lamore Walker, who swam for the United States at the 1948 Olympic Games in London, won three national championships, and later in life set hundreds of national and world swimming records in several masters age groups, has died. Walker died Friday of natural causes at an assisted living facility in North Smithfield, Rhode Island, according to her great-niece, Alyssa Kent. She was 94. She participated in the 200-meter breaststroke in the Olympics when she was 22 years old, but swore after her last heat that she was giving up competitive swimming for good, according to her biography on the International Swimming Hall of Fame website. She started a job with the telephone company, joined a cloistered religious order, graduated from Providence College, worked as an English teacher and guidance counselor in the Cranston schools, and got married. She didn’t start swimming again until she was 54, after her doctor …