Cassidy was born on November 25, 1986, in Los Angeles, California. She is the only child of actor and singer David Cassidy and fashion model Sherry Williams.

Katie Cassidy is widely known for her portrayal of Laurel Lance/Black Canary in the television series “Arrow.” She has also appeared in other popular shows like “Supernatural” and “Melrose Place.

Her father, David Cassidy, was a pop star in the 1970s. Her famous relatives include uncles Shaun Cassidy, Patrick Cassidy and Ryan Cassidy, the sons by her grandfather Jack Cassidy's marriage to Shirley Jones; Katie's grandmother was Evelyn Ward.

Katie Cassidy, who stars on "Arrow," is the actor's daughter with former model Sherry Williams. Days before he died, David Cassidy's rep told ABC News that he had been hospitalized with organ failure and was in critical condition.