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Gavan O'Herlihy (29 July 1951 - 15 September 2021) was an Irish actor. He was known for playing Chuck Cunningham in the first episodes of the television sitcom Happy Days, as well as his appearances in films such as Never Say Never Again, Superman III, Death Wish 3, and Willow. He was the son of actor Dan O'Herlihy.

The Descent: Part 2
as Vaines

Cruise of the Gods
as Mickey

Butterfly Man
as Bill Kincaid

18 Wheels of Justice

Sharpe: The Legend
as Leroy

Prince Valiant
as King Thane

Jonathan Creek
as Hal Drucker

Top of the World
as Lieutenant Logan

Midsomer Murders
as George Arlington

The Shooter
as Dick Powell

Star Trek: Voyager
as Maje Jabin

The Last Outlaw
as Marshal Sharp

Sharpe's Eagle
as Captain Thomas Leroy

Sharpe
as Cpt. Leroy

Conagher
as Chris Mahler, Cowboy

Twin Peaks
as Officer Preston King

Red King, White Knight
as Clancy

Tales from the Crypt
as Richard

Lonesome Dove
as Dan Suggs

Willow
as Airk

China Beach

A Killing on the Exchange
as Dan Maitland

Death Wish 3
as Manny Fraker

The Dirty Dozen: Next Mission
as Conrad E. Perkins

Cover Up

Sherlock Holmes
as John Garrideb / James Winter

Space Riders
as Ron Harris

The Secret Adversary
as Julius P. Hersheimmer

Agatha Christie's Partners in Crime
as Julius P. Hersheimmer

Never Say Never Again
as Jack Petachi

Superman III
as Brad Wilson

Matt Houston
as Michael Sheridan

We'll Meet Again
as Capt Red Burwash

A Rumor of War
as Stanton

Mark Twain: Beneath the Laughter
as Young Clemens

A Wedding
as Wilson Briggs

Sergeant Matlovich vs. the U.S. Air Force
as Art Stinson

The Amazing Spider-Man
as David

A Death in Canaan
as Father Mark

The Ghost of Cypress Swamp
as Big Bob Landers

The Bionic Woman

The California Kid
as Tom

Police Woman
as Gordon Stuart

The Healers

The Six Million Dollar Man
as Dan

Happy Days
as Chuck Cunningham

Call to Danger
as Mechanic

The Mary Tyler Moore Show
as Josh McBride (as Gavin O'Herlihy)

Marcus Welby, M.D.
as Herb Frane