The former film and TV star died on Monday, March 31 of Alzheimer's Sian Barbara Allen, the beloved star of The Waltons, has died. She was 78. The actress died of Alzheimer's in Chapel Hill, N.C., on Monday,

Sian Barbara Allen, who appeared in several TV series and TV movies through the early 1970s to late '90s, has died. The Golden Globe nominee died Monday at age 78, her family announced.

Actress Sian Barbara Allen, who starred in popular TV shows such as The Waltons, Gunsmoke, and Ironside, died on Monday at the age of 78. Her sister Meg Pokrass said in a Facebook post that Allen passed away “peacefully.