He explicitly cut out daughter Katherine Cassidy as a beneficiary.
Cassidy's relationship with Katie, his only daughter, was strained in recent years.
It comes just weeks after Katie posted a touching message on social media following her father's death saying "Words cant express the solace our family's received from all the love & support during this trying time".
In February, David told People that despite he was Katie's biological father, he never shared a relationship with his eldest child and is no longer in contact with her. "She has a completely different life", David explained to PEOPLE.
The "Arrow" actress was mostly raised by mother and stepfather, Williams' husband, Richard Benedon, the Miami Herald reported. "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".
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"I've never had a relationship with her", he said.
In a tweet after her father's passing, Katie Cassidy thanked fans for their well wishes and also revealed that Cassidy's final words at a Florida hospital were, "So much wasted time". Despite the distance between them, the "Flash" star recently revealed her father's last words will inspire her throughout the rest of her life. Cassidy's three half-siblings will get anything that is deemed to be "music memorabilia".
The will was drafted in 2004 and originally named his then-wife Susan as personal representative, but the role fell to his cousin after their divorce in 2016. "'It's hard for me to even accept how old she is now, like 30".
As of late, Katie has not yet commented regarding her dad's decision to leave her out of his will.
"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. Pictured: The Cassidys arrive at the 9th annual Family Television Awards held at the Beverly Hilton Hotel on November 28, 2007 in Los Angeles.