Don Keefer

Don Keefer was an actor who played Cromwell in the second season episode .
He filmed his scenes on Monday and Tuesday at the Paramount Pictures backlot and Desilu Stage 10.
Keefer was born as Donald Hood Keefer in Highspire, Pennsylvania, USA on 18 August 1916. He was one of the founding members of the in Manhattan, New York. He was married to actress Catherine McLeod between 1950 and her death in 1997. The couple had three sons, Don Keefer Jr., Tom Keefer, and John Keefer. Tom and John Keefer are working as grips in the camera and electrical department of the film and television industry.
He made guest appearances in many other television series, including , , The Twilight Zone, (starring Ray Walston), Mission: Impossible, , , (with Lee Meriwether), (with Garry Walberg and Robert Ito), (starring David Soul), (with Victor Tayback), and Picket Fences (with Ray Walston and Roy Brocksmith), as well as the pilot movie for . He also appeared in the 1972 TV movie Columbo: The Most Crucial Game, along with James Gregory, Susan Howard, and Dean Stockwell. His other TV movies include (1975, with Ronny Cox, John Fiedler, and Sid Haig), (1976, with Andrew Robinson), The Girl in the Empty Grave (1977, with Jonathan Banks and James Cromwell), The Immigrants (1978, with Stephen Macht), Samurai (1979, with Michael Pataki), The Scarlett O'Hara War (1980, with Clive Revill and Warren Munson), (1985, with Ray Walston and James Sloyan), and Lucy & Desi: Before the Laughter (1991, with Alan Oppenheimer).
Keefer also had several films to his credit. He had a small role in (1969), which also featured fellow Original Series guest actors Jeff Corey and Ted Cassidy and guest star Kenneth Mars. Prior to this, he and another Original Series guest star, Whit Bissell, had uncredited roles in (1954), which earned several Academy Award nominations. That same year, Keefer and Bissell co-starred with William Schallert in . Keefer and Schallert went on to appear in (1955) and (1958, with Richard Carlyle).
In 1966, Keefer appeared in , with Brian Keith, Andrea Dromm, Theodore Bikel and Michael J. Pollard). In 1970, he co-starred with Gary Lockwood, Paul Winfield, and Graham Jarvis in and the following year, he and his "Assignment: Earth" co-star Robert Lansing appeared in The Grissom Gang, which starred Kim Darby and also featured Hal Baylor. In 1973, he and Kenneth Tobey appeared in . That same year, he co-starred with in .
Other film credits include (1962, with Clegg Hoyt), (1973, with Dick Miller), (1973, with Bill Quinn), (1974, with Dick Miller and Bill Erwin), (1977, with Richard Libertini), (1977, with John Rubinstein and Ronny Cox), Samurai (1979, with Michael Pataki, Walt Davis, Johnny Haymer, Bob Minor, Tom Lupo, and Greg Barnett), (1982, in the same segment which featured Adrienne Barbeau, Fritz Weaver, and Robert Harper; the film also starred Jon Lormer), and (1991, with Jeremy Roberts). His last film appearance was in (1997, featuring Anne Haney and Randy Oglesby.
Keefer died of natural causes at his home in Sherman Oaks, Los Angeles on 7 September 2014. 
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