Sian Barbara Allen, the actor known for numerous television roles and her lead role in “Scream, Pretty Peggy” alongside Bette Davis, died Monday in Chapel Hill, N.C. Allen’s death was confirmed to Variety with the cause of death being Alzheimer’s disease.

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,

WASHINGTON — Actress Sian Barbara Allen, who played the lead role in “ Scream, Pretty Peggy ” and was John-Boy’s love interest in two episodes of “The Waltons” during the 1970s, died March 31. She was 78. Allen died from Alzheimer’s disease in Chapel Hill, North Carolina, her family said in an obituary.