He already had a will drawn out to express his wishes as to how his assets should be distributed after his demise but intentionally chose to cut his daughter out of it.
The relationship between David and his family had been strained due to his battle with alcoholism, but in spite of their past conflicts, his family rushed to his side after hearing of his hospitalization. She was raised by her mother, with David telling People magazine in 2009, "Because I didn't raise her, I didn't have to parent her". She has a completely different life.
"It is my specific intent not to provide any benefits hereunder to Katherine Evelyn Cassidy, and/or any descendent of Katherine Evelyn Cassidy", he wrote.
He said, however, that he was proud of her achievements as an actor. "'It's hard for me to even accept how old she is now, like 30". "Of course, that does not mean that the disinherited child will not contest the will specially if facts can be shown that the relationship was repaired".
Remaining "music memorabilia" was designated to David Cassidy's three half-siblings, according to The Blast. The Blast revealed that Cassidy's will was created in 2004 by his personal representative and then-wife, Susan Cassidy.
Despite this, the two had a relationship and she was among those by his hospital bed when he died, tweeting days later, "My father's last words were "So much wasted time".
In February, Cassidy told People he hadn't played a big role in her life and admitted they weren't in contact.
However, they had become estranged in recent years, with Katie only reuniting with her dad on his deathbed.
"All references in this Trust to my "child or children" are to BEAU DEVIN CASSIDY and such references shall not include KATHERINE EVELYN CASSIDY nor any descendant of Katherine Evelyn Cassidy", the will stated. Katie and Cassidy were last pictured together at a red carpet event in 2007.