She may have been the one woman in David's life whose relationship with him lasted longer than any of his marriages. And, she may have been the only one who never wanted to marry him. Yet, Sherry Williams-Benedon - mother of his first child - remained largely in the shadows. Who is she? How did they meet? Why did they never marry? And how did she raise their child, the actor Katie Cassidy, a third generation Cassidy talent? The world has never heard from her, but they will now, with Benedon's first-ever interview.