Biography
John Patrick Mahon (February 2, 1938 - May 3, 2020) was an American film, stage and television actor. He was known for Armageddon (1998), L.A. Confidential (1997) and Zodiac (2007).

Acting
Scranton, Pennsylvania, USA
Born · Died
John Patrick Mahon (February 2, 1938 - May 3, 2020) was an American film, stage and television actor. He was known for Armageddon (1998), L.A. Confidential (1997) and Zodiac (2007).

A Call to Arms· 2009
Major General Cosgrove USMC

Zodiac· 2007
Riverside Captain

Just Ask My Children· 2001
Judge Ferguson

Austin Powers: The Spy Who Shagged Me· 1999
NATO Colonel

Armageddon· 1998
Karl

L.A. Confidential· 1997
Police Chief

The American President· 1995
Chairman of the Joint Chiefs

Roswell· 1994
Red Hat Vet

Final Shot: The Hank Gathers Story· 1992
LMU Coach

One False Move· 1991
Chief Jenkins

The People Under the Stairs· 1991
Police Sergeant

The Couch Trip· 1988
Police Captain

Six Against the Rock· 1987
Officer Bill Miller

Betrayed by Innocence· 1986
Bailiff

Victims for Victims: The Theresa Saldana Story· 1984

Someone's Watching Me!· 1978
Frimsin

A Killing Affair· 1977
Det. Shoup

Collision Course: Truman vs. MacArthur· 1976
Gen. Hoyt Vandenberg

The Exorcist· 1973
Language Lab Director

Zoey 101· 2005
Mr. Bradford

Crossing Jordan· 2001
Police Captain

Star Trek: Enterprise· 2001
Admiral Gardner

The Division· 2001
Barry Constansas

Angel· 1999
Trevor Lockley

Just Shoot Me!· 1997
Col. Alan Drake

Arli$$· 1996
Bert Shaw

Profiler· 1996
Det. Spitz

The Pretender· 1996
Eugene Clark

JAG· 1995
Admiral Rockerly

Touched by an Angel· 1994
Wally

Diagnosis: Murder· 1993
Fire Chief

Frasier· 1993
Walt Crane

The X-Files· 1993
General Wegman

Flesh 'n' Blood· 1991
Holly's Dad

Baywatch· 1989
Arnold Anderson

Jake and the Fatman· 1987
Jameson

MacGyver· 1985
Vendor

Misfits of Science· 1985
Technician

Crazy like a Fox· 1984
Lt. Doyle

Hunter· 1984
I.A.D. Officer #2

Manimal· 1983
Man

Scarecrow and Mrs. King· 1983

Knight Rider· 1982
Alfie Girdler

St. Elsewhere· 1982
Police Officer

T. J. Hooker· 1982
Mr. Zewecki

Hill Street Blues· 1981
Detective McConnell

Knots Landing· 1979
Surveillant

Police Woman· 1974
Fireman

The Rockford Files· 1974
Todd Morris

Kojak· 1973
Lawton