[2] She entered Wayne State University, majoring in journalism and political science, where she learned how to act in school theater productions.

[4] After performing in amateur theatricals and light opera,[5] her first professional part was a lead in a production of The Boy Friend at the Vanguard Playhouse in Detroit.

Kelly was a fellow actor and, a month after their wedding, he and Devon appeared together on stage in Lillian Hellman's Toys in the Attic at the Laguna Beach Summer Theater.

I had voice, dancing and acting lessons: Louis Graveure coached me in singing, Charles Conrad in drama, and the studio paid the bills.

[2] Following that, she appeared in: Insight, The New Breed, The Twilight Zone, Stoney Burke, The Alfred Hitchcock Hour, Rawhide (an episode entitled "Canliss", as Dean Martin's gunfighter character's wife in 1964), Bob Hope Presents the Chrysler Theatre, The Rogues, Bonanza, I Spy, The Fugitive, T.H.E.

[6] In addition, Devon appeared in five feature-length commercial films, playing Rusty Sartori in Goodbye Charlie (1964), Julie Kazarian in Red Line 7000 (1965), Marie Champlain in Chamber of Horrors (1966), Rosemary in A Covenant with Death (1967) and Edie Hart in Gunn (1967).

She can be heard on the soundtrack to the 1975 film Mr. Sycamore, performing the song "Time Goes By", written by her then husband, Maurice Jarre, and lyricist Paul Francis Webster.