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.

Sian Barbara Allen has died aged 78. Best known for her roles in 1970s television shows including ‘The Waltons’, ‘Gunsmoke’, ‘The F.B.I.’ and ‘Love, American Style’, she passed away peacefully after a lengthy period of ill health,

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.