Danny de la Vega was a firefighter working in the Starling City Fire Department and an ex-member of the firefighter unit known as The Fireflies. He was the son of an unnamed woman, and the brother of Joanna de la Vega.
While on duty inside a burning building in early 2013, he encountered his former coworker Garfield Lynns, who had supposedly perished in a fire in 2009. Unaware of who the man was, Danny requested his assistance in putting out part of the fire. Instead, Lynns doused Danny in an inflammatory liquid before lighting him on fire, causing him to burn to death.