LOS ANGELES Comedian Bill Cosby sued model Beverly Johnson on Monday, saying she defamed him by accusing him of drugging her, and making her the eighth accuser he has filed suit against this month. Johnson is among more than 50 women who have come forward in the past year with claims that Cosby had drugged, and in numerous cases, sexually assaulted them in incidents dating back decades. He is demanding a jury trial, court documents filed in Los Angeles Superior Court showed. Johnson, 63, wrote a detailed article in Vanity Fair in November 2014 about her encounter with Cosby in the mid-1980s, saying she was invited by the comedian, best known for his role in the 1980s sitcom "The Cosby Show," to his home where he allegedly drugged her coffee.