He appeared in London's West End production of Time and returned to Broadway in Blood Brothers alongside Petula Clark and his half-brother, Shaun Cassidy.

He appeared twice each on two other NBC westerns Tales of Wells Fargo with Dale Robertson, one episode in the role of Butch Cassidy, and The Restless Gun with John Payne in two episodes entitled " The Pawn " and " The Way Back ", the latter with Bonanzas Dan Blocker.

Cassidy appeared on many shows alongside his stepmother, including A & E Biography, TV Land Confidential, and The Today Show, and he was one of the presenters of his stepmother's Intimate Portrait on Lifetime Television and the defunct reality show In Search of the Partridge Family, where he served as co-executive producer.

Many notable actors appeared on the series, including Ed Asner, Mary Astor, Roscoe Ates, Gene Barry, Ed Begley, Barbara Bel Geddes, Charles Bronson, Edgar Buchanan, Macdonald Carey, Art Carney, John Cassavetes, Jack Cassidy, Dabney Coleman, Tom Conway, Joseph Cotten, Bob Crane, Hume Cronyn, Robert Culp, Bette Davis, Francis De Sales, Bruce Dern, Brandon deWilde, Angie Dickinson, Diana Dors, Robert Duvall, Denholm Elliott, Peter Falk, John Forsythe, Anne Francis, Lorne Greene, Edmund Gwenn, Sir Cedric Hardwicke, Charles Herbert, Dame Wendy Hiller, Skip Homeier, Lou Jacobi, Joyce Jameson, Carolyn Jones, Don Keefer, Brian Keith, Jack Klugman, Jessie Royce Landis, Peter Lawford, Christopher Lee, Cloris Leachman, Peter Lorre, John McIntyre, E. G. Marshall, Herbert Marshall, Walter Matthau, Darren McGavin, John McGiver, Lee Majors, Jayne Mansfield, Steve McQueen, Tyler McVey, Audrey Meadows, Joyce Meadows, Vera Miles, Elizabeth Montgomery, Joanna Moore, Roger Moore, Vic Morrow, Leslie Nielsen, Robert Newton, Fess Parker, George Peppard, James Philbrook, Sydney Pollack, Judson Pratt, Robert Redford, Michael Rennie, Burt Reynolds, William Shatner, Dan Sheridan, Henry Silva, Barbara Steele, Jan Sterling, Dean Stockwell, Stella Stevens, Beatrice Straight, Jessica Tandy, Torin Thatcher, Rip Torn, Dick Van Dyke, Robert Vaughn, Richard Waring, Dennis Weaver, Estelle Winwood, Joanne Woodward, Fay Wray, and Keenan Wynn.

In August 2010, LuPone appeared in a three-day run of Irving Berlin ’ s Annie Get Your Gun, in which she played the title role opposite Patrick Cassidy, at the Ravinia Festival, directed by Lonny Price.

Cara appeared in on-and off-Broadway theatrical shows including the musicals Ain't Misbehavin ', The Me Nobody Knows ( which won an Obie award ), Maggie Flynn opposite Shirley Jones and Jack Cassidy, and Via Galactica with Raul Julia.

In 1990, Redd Kross signed with Atlantic Records, releasing Third Eye, and appeared with David Cassidy in the film Spirit of ' 76, and issued several singles, including " Annie's Gone ", which had some mild success on college radio.

Martin appeared in all three of the classic Westerns released in 1969: Sam Peckinpah's The Wild Bunch ( as Coffer, a bloodthirsty bounty hunter ); George Roy Hill's Butch Cassidy and the Sundance Kid ( as Percy Garris, the " colorful " Bolivian mine boss who hires the two title characters ); and Henry Hathaway's True Grit ( as Colonel Stonehill, a horse dealer ).

She appeared with Newman again, in a brief role as a prostitute in Butch Cassidy and the Sundance Kid ( 1969 ).

In the 1960s television series, Thing — strictly speaking, a disembodied forearm, since he occasionally emerged from his box at near-elbow length — was usually played by Ted Cassidy, who also played the lugubrious butler Lurch, although the two characters occasionally appeared in the same scene ( in which case Thing would be played by a crew member, notably assistant director Jack Voglin ).

The first Hopalong Cassidy stories by Clarence l. Mulford appeared in 1904 both as dime novels and in pulp magazines.

Gordon performed at a concert in Hawaii on September 21 with Kimock and Kreutzmann and, on November 2, appeared during the second set of a Ratdog concert at the Memorial Auditorium in Burlington, Vermont, joining the band on the songs " Stuff ", " Bird Song " and " Cassidy ".

Frequently cast as a bespectacled, ineffectual milquetoast, Furth appeared in such films as The Best Man, Myra Breckinridge, Hooper, Blazing Saddles, Oh God !, Shampoo, The Cannonball Run, Young Doctors in Love, Doctor Detroit, Bulworth and Butch Cassidy and the Sundance Kid.

Cassidy later appeared as a guest star in a 1971 episode as Ted's highly competitive and equally egotistical brother, Hal.

Boyd appeared as Hopalong Cassidy on the cover of numerous national magazines, including the August 29, 1950 issue of Look and the November 27, 1950 issue of Time.

A few actors of future prominence appeared in Cassidy films, most notably Robert Mitchum, who appeared in seven of the films at the beginning of his career.

In the two-part The Six Million Dollar Man episode titled " The Return of Bigfoot ", Cassidy appeared as " Bigfoot " ( played by André the Giant in a previous two-parter ).

* The Gorn captain's vocalizations were provided by actor Ted Cassidy, who also appeared in person in the Star Trek episode " What Are Little Girls Made Of?

He appeared as Lu Libble in Jack Kerouac's novel Maggie Cassidy, a fictionalized account of Kerouac's early life.

In 2007, Tozer appeared in a production of Dial M for Murder and in October began touring with the production Over the Rainbow-the Eva Cassidy Story playing Eva Cassidy.

From then on, he and Cassidy ( who is the only musician who appeared on all Spirit albums ) stuck together.

On non-broadcast nights, Cassidy appeared onstage at intermission to welcome the audience to the venue.

The play The Reckoning of Kit and Little Boots by Nat Cassidy, examines the lives of the Elizabethan playwright Christopher Marlowe and Caligula, with the fictional conceit that Marlowe was working on a play about Caligula around the time of his own murder.

* 1949 – The first television western, Hopalong Cassidy, is aired on NBC starring William Boyd.

Herr Starr reveals to Cassidy that Jesus had children, and did not die on the cross, but instead lived to middle-age, and was killed by a runaway offal cart.

* June 24 – The first television western, Hopalong Cassidy, airs on NBC.

The first observation of di-positronium molecules — molecules consisting of two positronium atoms — was reported on 12 September 2007 by David Cassidy and Allen Mills from University of California at Riverside.

The film's striking cinematography was by Conrad Hall, who went on to win three Academy Awards for his work on the films Butch Cassidy and the Sundance Kid, American Beauty and Road to Perdition.

On the special she performed show tunes and comedy bits alongside comic legend George Burns, teen matinee idol Shaun Cassidy, popular television star John Ritter ( during his days on Three's Company ), and even the Harlem Globetrotters joined her for a montage.

* In 1974, David Cassidy recorded the song as part of a medley of rock and roll songs, it's available on the album Cassidy Live!

) As Australian Republican Movement member Frank Cassidy put it in a speech on the issue: " In short, we want a resident for President.

The victims were: Stephen McCann ( 21 ), a Queen's University student murdered on 30 October 1976 ; Joseph Morrissey ( 52 ), killed on 3 February 1977 ; and Francis Cassidy ( 43 ), a dock-worker who died on 30 March 1977.

Cassidy was one of the contestants on Celebrity Apprentice 2011, in which his daughter Katie Cassidy made a brief appearance at her father's request.

Once " I Think I Love You " became a hit, Cassidy began work on solo albums as well.

By this point, Cassidy had decided to quit both touring and acting in The Partridge Family, concentrating instead on recording and song-writing.

NBC created a show based on it, called David Cassidy: Man Under Cover, but it was canceled after one season.

Cassidy returned to the American Top 40 with his 1990 single " Lyin ' To Myself ," released on the Enigma Records label.

The BBC telecast an episode of The One Show with Cassidy as guest on April 11, 2011.

Nancy Sinatra had this to say on her family's website later that day: " Cassidy is a real jerk who never cleared rights to the Sinatra name for his Sinatra show and he deserves his karma for breaking copyright laws.

On November 25, 1986, after 15 years of an on and off relationship with high fashion model Sherry Williams, she gave birth to David's only daughter, Katherine Evelyn Cassidy ( Katie ), now a successful film actress.

Cassidy and Shifrin married on March 30, 1991.

Cassidy was arrested in Florida for DUI on November 3, 2010.