Singer-actor David Cassidy and his wife, Sue, are divorcing after nearly 23 years of marriage.

Sue Shifrin-Cassidy, 64, said in a statement Tuesday that her divorce filing "has been looming for some time," adding "I am truly heartbroken that our marriage is ending."

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David Cassidy, 63, told E! News Tuesday, "It is very sad that Sue chose to take this approach. I have tried to resolve this amicably outside of the public eye. I have reached out to her with no response over the last 3 months. It's a sad day for me and for our son Beau," a 23-year-old singer-songwriter. He has another child, "Arrow" star Katie Cassidy, from a previous relationship.

Cassidy -- who gained fame in the 1970s musical sitcom, "The Partridge Family" -- recently entered rehab. He was formally charged with DUI on Feb. 4 after a Jan. 10 arrest in Los Angeles, and had DUI arrests near Schodack, N.Y., in August 2013 and in St. Lucie County, Fla., in November 2010.