He also created supporting roles in the stage productions of "Who's Afraid of Virginia Woolf?,""A Delicate Balance,""The Texas Trilogy" and "The Birthday Party."
Forsythe replaced Ernest Graves in "As the World Turns" in 1960 and portrayed Dr. Stewart until the character's unfortunate demise in 1991.
His film credits include "Silkwood" and "End of the Line" while his TV roles ranged from the father of "Dr. Kildare" to episodes of "Law & Order." In 1994, he was Col. Harland Sanders in commercials for KFC restaurants.
Forsythe is survived by his wife, two sons and four grandchildren.