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While the starship was on the way to Nahmi IV, he was ordered to realign the magnetic capacitors together with his colleague Costa. During the mission he was contaminated with invidium and subsequently spread this element throughout several ship's systems. While drinking a beer in Ten Forward, he contaminated his glass with the invidium and thereby changed its molecular structure, causing it to leak. (TNG: "Hollow Pursuits")
In Pocket Books non-canon Star Trek: Starfleet Corps of Engineers series, Duffy appears (in the post-Dominion War era) as the second officer of the series' ship, USS da Vinci, rank of lieutenant commander. In the books, his first name is Kieran, which coincidentally is also MacDuff's first name. He is also said have had a past relationship with da Vinci first officer Sonya Gomez when they both served aboard the Enterprise. When the da Vinci became trapped in the gas giant, Galvan IV, Duffy gave his life to complete his mission and ensure the safety of his crewmates.