Alex Ryan is the secondary antagonist of the Law and Order: Special Victims Unit episode "Know It All". He is a serial killer and rapist who preys on drunk women who leave bars on their own.
He is portrayed by Bill Dawes.
Very little is known about Ryan's past, other than being a serial killer who raped and violently killed his female victims after giving them a ride. He was also hunted by the SVU who was already eyeing him, and then he was soon arrested when he offered to give a ride to a woman, and she denounced him. After the arrest, he at first denied it but when the evidence hit, he confessed to the murders with a sadistic smile, and was arrested off-screen.