- Turned down the role of Ted Baxter on The Mary Tyler Moore Show (1970), but did guest star as Ted Baxter's brother.
- Father, with Evelyn Ward of son David Cassidy. Father, with Shirley Jones, of sons Shaun Cassidy, Ryan Cassidy and Patrick Cassidy.
- According to Cassidy's ex-wife Shirley Jones, on December 11, 1976, Cassidy asked her over for drinks but she declined his invitation. He then ate dinner alone at an Italian restaurant. Cassidy returned to his apartment by himself, by which time he was drunk. In the early morning hours of December 12, Cassidy lit a cigarette and fell asleep on his Naugahyde couch. He then dropped the cigarette, which ignited the couch. The flames quickly spread throughout the apartment and the building.
- He died when his couch, and subsequently apartment, caught fire after he fell asleep on it with a lit cigarette.
- A charred body, burned beyond recognition, was found in the doorway of Cassidy's apartment. As Cassidy's car was missing (it was later returned by a friend who had borrowed it), his family hoped that he had traveled to Palm Springs, which were his intended plans for the following day but the body was then positively identified as Cassidy's by dental records and by a signet ring that he wore, bearing the Cassidy family crest.
- Worked as a bell hop, counterman, dishwasher, chauffer, clothing salesman, postal clerk, hotel clerk, stable boy, coal and ice truck handler before getting his big break.
- While researching his Irish ancestry, he discovered his family's crest. He had 6 gold pinky rings made bearing the crest, and gave one to each of his 4 sons and one to his brother. His own ring helped authorities identify his remains. It was later stolen from his son, Patrick Cassidy's house.
- Received help entering show business from a family member who was a contortionist in the circus.
- On June 24, 2005, the Hollywood Chamber of Commerce announced he would receive a posthumous star on the Hollywood Walk of Fame for live theatre.
- In his 1994 autobiography, C'Mon, Get Happy, Cassidy's eldest son David wrote that he became increasingly concerned about his father in the last years of his life. Jack Cassidy suffered from bipolar disorder and was an alcoholic, who was displaying increasingly erratic behavior.
- Apart from his having depression, it has been suggested that Jack Cassidy suffered from schizophrenia.
- In December 1974, Cassidy was hospitalized in a psychiatric facility for 48 hours. At that time, Jones found out that he had been previously diagnosed with bipolar disorder.
- The role of the vain, shallow, buffoon-like newsman Ted Baxter on TV's The Mary Tyler Moore Show (1970-1977) was reportedly written with Cassidy in mind. Although Cassidy had played a similar buffoonish character in the 1967-68 sitcom He & She, he turned down the role, feeling that it was not right for him; the part went to Ted Knight.
- In 1974, his neighbors were shocked to see him watering his front lawn naked in the middle of the afternoon. Cassidy's second wife Shirley Jones described a similar incident when she found him sitting naked in a corner, reading a book. Jones said to Cassidy that they had to get ready to do a show, and he calmly looked up and said, "I know now that I'm Christ".[.
- The 4th floor penthouse where he died is located at 1221 North Kings Road, West Hollywood.
- Along with Patrick McGoohan, Robert Culp, George Hamilton and William Shatner, he is one of only five actors to play two or more murderers in Columbo (1971): Ken Franklin in Murder by the Book (1971), Riley Greenleaf in Publish or Perish (1974) and Now You See Him (1976).
- Shirley Jones freely admitted to not being able to deal with Jack's bipolar disorder. They divorced in 1975.
- Portrayed by Malcolm McDowell in The David Cassidy Story (2000).
- In the March 15, 1965 The Alfred Hitchcock Hour (1962) episode, The Photographer and the Undertaker (1965), he played a hit man who disposes of the victim's body by setting fire to his apartment, which was the scene of the murder. This was an attempt to conceal the murder and have the authorities believe that he was the deceased. He later died in a fire, at his home, on December 12, 1976 and was so badly burned that he could only be identified by the unique ring he was wearing.
- Wrote a play, "A Waltz for Willie Ryan".
- David Cassidy also claimed that his father was bisexual, citing attributed personal accounts and reports, both anecdotal and published, of his father's same-sex affairs, a fact neither he nor his siblings discovered until after Cassidy's death. In her 2013 memoir, Shirley Jones confirms that Cassidy had many same-sex affairs, including one with Cole Porter.
- His remains were cremated and his ashes are scattered on the Pacific Ocean.
- According to David Cassidy, his father refused to encourage him in his own plans for a show business career.
- The actor believed he was broadening his range at the time of his sudden passing. He had been receiving some fairly lucrative movie offers.
- Made his Broadway debut at the age of 16 in the chorus of Cole Porter's "Something For The Boys.".
- One of the most Tony-nominated musical actors in Broadway history.
- Cassidy won the 1964 Tony Award for best featured actor in a musical for his role in She Loves Me and was nominated for two Emmy Awards: in 1968 for Outstanding Performance by an Actor in a Supporting Role in a Comedy, for He & She, and 1971 for Outstanding Single Performance by an Actor in a Leading Role for the film The Andersonville Trial (1970).
- Cassidy was approved for a star on the Hollywood Walk of Fame in 2005, and fund raising efforts are currently underway to fund the dedication ceremony.
- His idol was John Barrymore, whom he played in W.C. Fields and Me (1976).
- Born to William Cassidy, who was of Irish descent, and Charlotte Koehler, who was of German descent.
- Won Broadway's 1964 Tony Award as Best Supporting or Featured Actor (Musical) for "She Loves Me". This was followed with three other Tony nominations in the same category: in 1965 for "Fade Out -- Fade In," and as Best Actor (Musical) in 1966 for "It's a Bird...It's a Plane...It's Superman!" and in 1969 for "Maggie Flynn.".
- Mother Charlotte was from Hamburg, Germany.
- By his own admission, the actor had become more of a recluse during his later years.
- His father, William Cassidy, was a railroad engineer.
- He was nominated for a 1976 Joseph Jefferson Award for Director of a Play for "Wait Until Dark", at the Drury Lane Theatre North in Chicago, Illinois.
- After Jack Cassidy died Marty Ingels who later married Jacks ex-wife Shirley Jones took Jack and Shirleys 10 year old son Ryan to the apartment that Jack died in.
- Father-in-law of Tracey Lynne Turner, and Melissa Hurley. Former father-in-law of Ann Pennington, Sue Shifrin, Kay Lenz, and Susan Diol.
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