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Darcy was killed, along with many other survivors, when Colonel Stevens elected to destroy Gunnison with a tactical nuclear strike rather than risk the infestation spreading.
When Buddy and Sam Benson vanished while on a hunting trip, Darcy searched extensively for them, not realizing they had been killed by Xenomorph Chestbursters. When the Xenomorphs spread through Gunnison, Darcy discovered the dead remains of Carrie Adams and became hysterical. She was later found by Eddie Morales and joined him to the center of town to await a military airlift. However, the airlift was actually a tactical nuclear strike, and Darcy died in the explosion.