Max Ruddiger is a bombmaker who first appeared in “Gina Zanetakos”.
He built the car bomb for Gina Zanetakos. He was traced by the FBI since he called Gina to tell her that he had to change the nuclear material from caesium-137 to cobalt-60. Raymond Reddington offered him a Syrian contract to reveal Gina's plan and call her so that the FBI could arrest her.
Reddington visits him at a rehab facility where he is being treated after a car crash. Red wants information about an arms dealer.