William O'Connell

William O'Connell was the actor who played Thelev in the second season episode . He filmed his scenes on Friday and Monday at Desilu Stage 9.
O'Connell made his screen acting debut with an uncredited appearance in (1961, co-starring fellow Original Series guest actor Rex Holman). The following year, he appeared in the Thriller episode "A Wig for Miss Devore" and The Twilight Zone episode "Cavender Is Coming", both featuring John Fiedler, another Original Series guest actor. O'Connell would go on to co-star with Fiedler in a 1975 episode of Kolchak: The Night Stalker. He went on to appear in a 1963 episode of The Lieutenant, a series written by Star Trek creator Gene Roddenberry and starring Gary Lockwood. Also in 1963, both O'Connell and Original Series star James Doohan made uncredited appearances the 1963 comedy The Wheeler Dealers.
In 1964, he acted with Roy Jenson in an episode of The Outer Limits and with Morgan Woodward in an episode of Rawhide, and in 1966, he appeared with Meg Wyllie in the "Holloway's Daughter" episode of Bob Hope Presents the Chrysler Theater. He then co-starred with Brian Keith in (1966). O'Connell would again appear with Keith in (1971, featuring Richard Hale and Bill Zuckert). In 1968, O'Connell appeared in , as did Original Series guest actors Lloyd Haynes and Jonathan Lippe.
In 1969, he appeared with Perry Lopez and Robert Pine in the Wild Wild West episode "The Night of the Pistol", with Jean Simmons in , and with Robert Easton, Harve Presnell, and Ray Walston in . He would go on to appear in (1973, co-starring Marianna Hill) and (1976, with Erik Holland). He also appeared with Eastwood in (1978, also featuring Roy Jenson) and (1980, also with Roy Jenson as well as George Murdock and Logan Ramsey).
1971 saw O'Connell co-star with Peter Brocco and Garry Walberg in the Odd Couple episode "A Taste of Money". And in 1974, he appeared opposite his Original Series co-star William Shatner in , also featuring Dick Miller and Noble Willingham. 
O'Connell's last known on-screen acting appearance was in the 1991 made-for-TV movie The Haunted (with George D. Wallace).
O'Connell passed away on January 15, 2024 at his home in Sherman Oaks, Los Angeles, at the age of 94. 
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