While working at B5, Nolan became a member of the radial pro-Earth group Homeguard and collected material from them. On one occasion, he was openly hostile with an alien shopkeeper and caused damage to the shop. He was busted by Security Chief Michael Garibaldi, and he held a grudge afterward.
Later in the year, Nolan agreed to plant a bomb in one of the station's Cobra Bays to assassinate Earth Alliance President Luis Santiago who was due to visit Babylon 5. While "working," he started to plant the bomb and used a vibration detonator. Unbeknownst to him, there plasma drivers in the bay, causing the bomb to prematurely detonate. He was critically injured and rushed to Medlab where his diagnosis looked bleak. Against Dr. Stephen Franklin's orders, he was awoken in a critical state by Maj. Lianna Kemmer, head of the President's security detail, to question him about the bombing. Nolan died within minutes after being revived, but not before confirming it was a bomb and falsely implicating Garibaldi.