[2] Her mother, Elizabeth Harrower (1918–2003), was an actress and screenwriter who eventually became a part of the writing teams of The Young and the Restless and Days of Our Lives.

Her father, Harry Seabold, lived with his bride for 90 days during World War II, through his basic training near Oklahoma City.

He shipped out after his daughter was conceived and remained overseas for thirty-three months; during this time, Harrower returned to her family home in Berkeley.

Seaforth appeared in the TV series Cheyenne in the episode, "The Bad Penny", portraying a young murderess avenging the hanging of her outlaw father.

She gave a moving performance as the expectant Holly, who was fleeing her outlaw husband while falling in love with Dev, his bounty hunter played by Dennis Hopper, on "Bonanza" S5 E31 "The Dark Past", which aired in May 1964.

She is best-known for her work on the daytime soap opera Days of Our Lives in the role of Julie Olson Williams, which she played continuously from 1968 to 1984 and again from 1990 to 1993, with recurring appearances in 1994 and 1996.

In between appearances, she starred from November 1984 to May 1989 as Joanna Manning, mother to Tracey E. Bregman's character, Lauren Fenmore, on The Young and the Restless and as District Attorney Patricia Steele on Sunset Beach in that show's final months on the air.

Most recently, Seaforth Hayes made a cameo appearance in a music video for Chip Chocolate's "Cookie Dance" as Mrs.