As of June 2026, John O'Leary is best known for Law & Order and CSI: Crime Scene Investigation. Find every show and movie John O'Leary has starred in — and where to watch them — below.
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John O'Leary

Actor Born 1926 Newton, Massachusetts, USA 12 TV Shows 8 Movies

John O’Leary (born 5 May 1926 - died 5 June 2019) is an American actor.

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📺 John O'Leary's TV Shows

Law & Order
Ronny Napoli
1990
CSI: Crime Scene Investigation
Cranky Old Man
2000
Dexter
Bishop
2006
Desperate Housewives
Mr. Scully
2004
Frasier
Old Niles
1993
Brooklyn Nine-Nine
Franklin
2013
Curb Your Enthusiasm
Jim O'Malley
2000
Murder, She Wrote
Minister
1984
Buffy the Vampire Slayer
Council Member
1997
Buffy the Vampire Slayer
Kaltenbach
1997
Scandal
Terry
2012
Knots Landing
Professor Kromkowski
1979

🎬 John O'Leary's Movies

Airplane!
Reporter #2
1980
All the President's Men
Attorney #1
1976
Demon Seed
Royce
1977
The Last Starfighter
Rylan Bursar
1984
Stepfather 2
Sam Watkins
1989
Guardian Angel
Clayton
1994
Farewell, My Lovely
Marriott
1975
Heroes
Ticket Clerk
1977

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