Hollywood actress Mariclare Costello has died at the age of 90. She passed away on the morning of April 17, in Brooklyn, New York, according to the Peoria Journal Star. The star was best known for starring on the family TV show The Waltons. She played Rosemary Hunter Fordwick from 1972 to 1977. And she went on to make several other shows like The Fitzpatricks in 1977 with Helen Hunt and Jimmy McNichol where she played matriarch Maggie Fitzpatrick. The actress then starred in movies such as After The Fall in 1974 with Faye Dunaway and Christopher Plummer as well...