Gerald Stuart O'Loughlin Jr. (December 23, 1921 – July 31, 2015) was an American television, stage, and film actor and director who was primarily known for playing tough-talking and rough-looking characters. He is best known for his role as Ed Ryker on The Rookies (1972-1976). Description above from the Wikipedia article Gerald S. O'Loughlin, licensed under CC-BY-SA, full list of contributors on Wikipedia.​
  A Hatful of Rain
  Cop Hater
  City Heat
  Ice Station Zebra
  In Cold Blood
  The Organization
  Twilight's Last Gleaming
  Riot
  Desperate Characters
  The Secret Kingdom
  Lovers and Lollipops
  A Love Affair: The Eleanor and Lou Gehrig Story
  Pleasure Palace
  The Two Worlds of Charlie Gordon
  Child's Cry
  The D.A.: Murder One
  Crime of the Century
  Something for Joey
  Quicksilver
  The Crash of Flight 401
  Ensign Pulver
  Murder at the World Series
  Crimes of Passion
  In the Arms of a Killer
  The Valachi Papers
  Perry Mason: The Case of the Notorious Nun
  Dan August: Once Is Never Enough
  Frances
  Brothers-in-Law
  A Matter of Life and Death
  Wilson's Reward
  Detour to Terror
  A Man Called Adam
  Murder, She Wrote
  Titans
  M*A*S*H
  The Rookies
  Trapper John, M.D.
  T. J. Hooker
  Fame
  The Division
  The F.B.I.
  Judging Amy
  Simon & Simon
  Hawaii Five-O
  Quincy, M.E.
  Highway to Heaven
  Room 222
  Naked City
  Charlie's Angels
  Mannix
  Gunsmoke
  Mission: Impossible
  Cannon
  Cover Up
  Chicago Hope
  Going My Way
  Felony Squad
  Run for Your Life
  Cimarron Strip
  Jessica Novak
  Matt Houston
  Automan
  Our House
  Judd, for the Defense
  The Philco Television Playhouse
  Ben Casey
  Suspense
  Dr. Kildare
  The Asphalt Jungle
  The Eddie Capra Mysteries
  Kraft Mystery Theatre
  The Green Hornet
  Nichols
  The F.B.I.
  The F.B.I.
  Murder, She Wrote
  Code Red
  Blind Ambition
  Hawaii Five-O
  Murder, She Wrote
  The Blue and the Gray
  Women in White
  12 O'Clock High
  Wheels
  Dan August
  Ironside
  ER
  Murder, She Wrote
  Snoops
  Then Came Bronson
  Roots: The Next Generations
  For the People