Among the movies Hewitt appeared in are A Private's Affair, That Touch of Mink, Days of Wine and Roses, How to Murder Your Wife, Sweet Charity, and The Barefoot Executive.
He never became a major star, but he did have a lengthy career which included smaller parts in several well-known programs, including Alfred Hitchcock Presents, Maverick, 77 Sunset Strip, Daktari, Leave It to Beaver, The Donna Reed Show, Dr. Kildare, Lost in Space, Bewitched, I Dream Of Jeannie, The Lucy Show, F Troop, The Wild Wild West, Ironside, The Bob Newhart Show and The Phil Silvers Show. He made four guest appearances on Perry Mason, three of which he portrayed the murderer: in 1961 he played Bruce Sheridan in "The Case of the Wintry Wife" and Dr. Marcus Tate in "The Case of the Brazen Bequest," and in 1965 he played the role of Curt Ordway in "The Case of the Fatal Fetish". The only one where he was not the murderer was in 1959’s “The Case of the Golden Fraud”. Possibly his most prominent roles were Detective Brennan in My Favorite Martian and the district attorney in How to Murder Your Wife.
1978
as The Inspector
1977
as Dean Acheson
1975
as Mayor Coughlin
1973
as Congressional Chairman
1972
as Dean Collingsgood
1971
as Farnsworth
1970
as Hewlett
1969
as Dean Collingsgood
1969
as Judge Tanner
1969
as Koenig
1969
as Attorney
1969
as Nicholsby
1968
as Sol Levin
1967
as Sam Rose
1967
as Carter
1965
as Chauncy Talbot
1965
as Don Anderson
1965
as Lemnoc
1965
as District Attorney
1964
1964
as Linton H. Baldwin
1964
as Professor Shattuck
1963
as Det. Bill Brennan
1963
as Rad Leland
1963
as Prosecuting Attorney
1962
as Dutton
1962
1962
as Doctor Gruber
1962
as H. Arthur King
1961
as Attorney Backett
1961
as Mr. Buckley
1961
as General Hotchkiss
1960
as J.O. Clyde
1960
as Jack Harrison
1960
as Mr. Fifer
1959
as Matt Helmsley
1959
as Dr. Alfred Johnson
1959
as Alistair St. Clair
1959
as Maj. R.C. Hanley
1958
as Frank King
1957
as George Parker
1957
as Curt Ordway
1957
as Dr. Marcus Tate
1955
as Howard Cole
1955
as George Maynard
1955
as Albert Martin
1954
as Prosecutor (archive footage)