

Cast & creator
Best known for Hawaii Five-O, Batman, Batman
Jacques Joseph O'Mahoney, known professionally as Jock Mahoney, was an American actor and stuntman. He starred in two Western television series, The Range Rider and Yancy Derringer. He played Tarzan in two feature films and was associated in various capacities with several other Tarzan productions. He was sometimes credited as Jack O'Mahoney or Jock O'Mahoney. Jock entered the University of Iowa in Iowa City and excelled at swimming and diving, but dropped out to enlist in the United States Marine Corps when World War II began. He served as a pilot, flight instructor, and war correspondent. After his discharge from the Marine Corps, Mahoney moved to Los Angeles, and for a time was a horse breeder. However, he soon became a movie stuntman, doubling for Gregory Peck, Errol Flynn, and John Wayne. Most of Mahoney's films of the late 1940s and early 1950s were produced by Columbia Pictures. Like many Columbia contract players, Mahoney worked in the studio's two-reel comedies. Beginning in 1947, he starred with the Three Stooges in their films Out West, Squareheads of the Round Table (and its remake, Knutzy Knights), Fuelin' Around, and Punchy Cowpunchers. Beginning in 1950, Columbia management gave him starring roles in adventure serials. Mahoney contributed so much to this series that he was awarded featured billing and major supporting roles as well, first as villains and then as sympathetic characters. By 1952 Columbia was billing him as Jack Mahoney. Cowboy star Gene Autry, then working at Columbia, hired Mahoney to star in a television series. Autry's Flying A Productions filmed 79 half-hour episodes of the syndicated The Range Rider from 1951 to 1953. For the 1958 television season, he starred in the somewhat Western Yancy Derringer series for 34 episodes, which aired on CBS. Yancy Derringer was a gentleman adventurer living in New Orleans, Louisiana, after the American Civil War. He had a Pawnee Indian companion named Pahoo Katchewa ("Wolf Who Stands in Water"), who did not speak, played by X Brands. Pahoo had saved the life of Derringer, and thereafter was responsible for Derringer's life. In 1962, Mahoney became the 13th actor to portray Tarzan when he appeared in Tarzan Goes to India, shot on location in India. A year later, he again played the role in Tarzan's Three Challenges, shot in Thailand. Dysentery and dengue fever plagued Mahoney during the shoot in the Thai jungles, and he plummeted to 175 pounds. He needed a year and a half to regain his health. Owing to his health problems and the fact that producer Weintraub had decided to go for a "younger look" for the apeman, his contract was mutually dissolved. In the 1980s, Mahoney made guest appearances on the television series B. J. and the Bear and The Fall Guy. During the final years of his life, he was a popular guest at film conventions and autograph shows. Mahoney died of a second stroke at age 70, two days after being involved in an automobile accident in Bremerton, Washington. His ashes were scattered into the Pacific Ocean.
Also known as: Jack Mahoney, Jack O'Mahoney, Jacques O'Mahoney, Jock O'Mahoney, Jacques Joseph O'Mahoney
76
film credits
28
television credits
93
1946–2017 · acting roles
6.6
average across scored titles
Signature credits
Across film & television
Showing 104 of 104 credits

Coley Bennett
1969
Leo
1966
H.L. Hunter
1966
Hoyt Herrold
1972
Oldtimer #1 in Saloon
1981
O'Connor
1964
Captain Brian Donahoe
1959
Vance
1959
Wild Dan Wilde
1981

Mr. Morley
1972
Barry James
1958
Vance Ludlow
1955
Hoby Wallington
1966
Yancy Derringer
1958

Albert Bates
1972
Driver
1954
Andy Hagen
1953
Ernie McNally
1953
Mike Elliott
1953
Jim Vessey
1953
Kim Ryan
1953
Dan O'Hara
1953
Mark Richards
1984
Halsey Roland
1961
Driver
1968
The Range Rider
1951
Stunt Double
1948
Stoner
1968
Stunts
1948
Brad Ellison
1958
Immerman
1958
Stunts
1949
Stunt Double
1952
Stunt Double
1949
Duke Fisher
1951
Stunts
1951
Tulsa Jack Blake
1949
The Stranger
1957
Tarzan
1962
Cedric the Blacksmith
1954
Jim Archer
1950
Tarzan
1963

Alvick
1956
'Silver' Ward Hogan
1958
Davidson
1972
Crake
1951
Coy Banton
1960
Sandy
1950
Stunt Double
1950
Pete Reagan
1949
Maj. Frank Moore
1957
Bill Grant
1949
Commander Harold 'Alan' Roberts
1957
The Colonel
1970
Stunt Double
1948
Arizona Kid
1947
Marshal Allan Burnett
1956
Tavern Troublemaker
1951
Stunt Double
1951
Stunt Double
1948
Tarzan (Archive Footage)
2017
Self
1979
Tex Kinnane
1950
Tim Starling (uncredited)
1949
Joe Ward
1954
Lieutenant Hunter
1949
Self
1984
Captain Kenley (uncredited)
1946
Cedric the Blacksmith
1948
Jim Grant
1951
Duke Wallace
1961
Jim Trask
1956
Jack Mahoney
1952
Jack Mahoney
1952
Tarzan (archive footage)
1996
John Bolan / Lt. Peter Stevens
1956
Smiley
1967
Big Jack Mahoney
1952
Henchman Tensleep (uncredited)
1947
Don Michael O'Casey
1963
Elmer
1950
Ross Granger
1954
Slim Carter (Hugh Mack)
1957
Stunts
1957
Full-House Patterson
1949
Guard
1949
Lt. Jim Sorenson
1964
Stoney Rhodes
1950
Jack Mahoney
1952
Jack Mahoney
1952
Jefferson Stark
1964
Bill Beck
1950
Swift Eagle
1952
Waco (uncredited)
1946
Randy Minola
1965
Sgt. Berry
1973
Lieutenant Peck (uncredited)
1950Self (archive footage)
2015
Jack Mahoney
1951
Rob Saunders
1950
Tod Jeffreys
1950