The US pop star and actor was admitted to a Florida hospital last week with multiple organ failure.
The family is also reportedly planning a public celebration of Cassidy's life for the "Partridge Family" star's legion of fans to mourn.
Fans shared memories of Cassidy online after his death Tuesday evening, with some sharing photos, others sharing remembrances of him being their first crush and video clips of his songs.
Cassidy continued to perform and tour throughout the latter half of his life, finding success in Broadway musicals like Joseph and the Amazing Technicolor Dreamcoat and the acclaimed musical Blood Brothers.Earlier this year, the star announced that he had been struggling with dementia, and wouldformally retire with a final concert at B.B. King's House of Blues.
"I have known, loved, and admired David Cassidy for 48 out of my 58 years".
"Oh, they're cute. They get flustered and I get flustered, and it's all kind of fun", Cassidy said of his devotees in 1972, when he was 21.
Salvation Army Red Kettle campaign begins
With a Packers beanie on and a bell in hand, the Congressman spent the afternoon at Pick 'n Save on Lombardi Access Road. On Nov. 17, the local unit of the Salvation Army kicked off its primary fundraising drive, The Red Kettle Campaign.
At the same time, Cassidy struggled with numerous personal problems. In 1972, in an attempt to shed his bubblegum image, David shed his clothes for photographer Annie Leibovitz for a Rolling Stone cover story. The fictional Partridge Family band was even nominated for Best New Artist at the 1971 Grammys. In the memoir Could It Be Forever, he wrote of his prolific sex life and claimed he'd rejected Dey's advances. He was married and divorced three times, battled alcoholism, was arrested for drunk driving and in 2015 filed for bankruptcy.
Cassidy's daughter, Katie, hasn't yet responded publicly to the news of her father's death. "I was her biological father but I didn't raise her", he told People magazine in 2017.
Shelly Wright came forward to Radar Online in 2013, claiming to be Cassidy's love child from a one-night stand he supposedly had with her mother, Donna G. Wallace, who claimed to have hooked up with Cassidy while she was separated from her husband, "famed Nashville songwriter, James Bohon" in 1973.
After the television show ended, Cassidy pursued an adult career, in and out of acting and music for the next several decades, regularly performing in Las Vegas.
"I mean, how much could an actor do with a line like, 'Hi, Mom, I'm home from school, ' or 'Please pass the milk?"' he wrote in his memoir.