Death Troopers

Death Troopers by Joe Schreiber
In this first-ever adult Star Wars horror novel, a rag-tag group of survivors trapped on board a ship drifting in space will have to fight to survive a terrifying virus-borne zombie outbreak.

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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books (if so, just think of it as an alternate universe).