It's all over for David Cassidy and his wife of 23 years.

TMZ has learned that Sue Cassidy had filed for divorce from her husband, though she is refraining from saying whether his ongoing alcohol struggles are to blame for the split.

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David Cassidy was arrested Wednesday in upstate New York for DUI.

According to the Schodack Police Department, the singer was busted just after midnight for felony driving while intoxicated ... and failure to dim headlights.

Posted in: David Cassidy