On February 4, 1963, she appeared as Sheriff Andy Taylor's old girlfriend Sharon DeSpain in the "Class Reunion" episode of The Andy Griffith Show. On April 9, 1963, McCay appeared in the episode "Broken Honor" of NBC's Laramie; she and Rod Cameron played Martha and Roy Halloran, a farm couple.
McCay guest-starred on ABC's The Roaring 20s, The Greatest Show on Earth, and Jason Evers's Channing. In 1963, she appeared on NBC's Redigo, with Richard Egan, and on CBS's Perry Mason (as defendant Margaret Layton in "The Case of the Skeleton's Closet"). In 1963 she was in an episode of The Virginian as Helen Hammond Judson, a woman seeking her husband. In 1964, after guest starring in The Fugitive, she returned to daytime television as a lead on ABC's The Young Marrieds. When the show went off the air in 1966, she was written into the story line on ABC's General Hospital (as Iris Fairchild) until 1970. In the 1970s, McCay appeared in Eleanor and Franklin: The White House Years, How the West Was Won, and The Lazarus Syndrome. McCay even appeared in the second season of Barnaby Jones; episode titled, "Blind Terror"(09/16/1973). She appeared in a 1975 television movie, John O'Hara's Gibbsville (also known as The Turning Point of Jim Malloy), and was a regular in the cast of the short-lived 1976 series Gibbsville. During the late 1970s and early 1980s, she had a recurring role as Marion Hume in the CBS drama Lou Grant.