 This was a grim weekend as we lost several celebrities. Beverly Hills 90210 star Shannon Doherty has died. Doherty, who lost her battle with breast cancer, was 53. James Sickick of Hill Street Blues has died at age 90. Fitness guru Richard Simmons has died. His publicist says Simmons died a day after his 76th birthday. And people are remembering the life of sex therapist and talk show host Dr. Ruth Westheimer.