John Byrne

John Byrne is a criminal whose name appeared on the List.

Dealing with the Hood
Engaging in human trafficking in Starling City, Byrne was attacked by the Hood, who handed him over to the authorities, rather than his typical method of murder, whereupon Byrne was incarcerated in Iron Heights.

Kidnapping William Clayton
Eight year later in 2020, wishing to seek revenge on Oliver Queen for his incarceration, Byrne in prison, he kidnapped his son, William Clayton. However, he was hunted down by Team Arrow and found by the new Green Arrow, who handed him over to the police.

Behind the scenes

 * The character's name is a reference to the comic book writer and artist of the same name, who Marc Guggenheim had previously name-dropped in an episode of Law & Order.