Lieutenant Sharon McGuinness was a human disgusted by the scientific going-ons concerning Colonel Doctor Paul Church. She was also displeased to learn that David, a man whom she'd been close to, was also Church's lover. Possibly a carrier of the Telepathine drug, she is able to escape and intimidate the Xenomorph Trixie and break Church's nose on a metal railing. Before she could do any more damage to the insane scientist, two guards intervene and she is knocked out by one of their rifle butts.

It soon established that McGuinness was framed for the murder of Crespi and was accused of being a "saboteur". McGuiness was later arrested by the United States Colonial Marine Corps and was last seen in a cell within a transport ship set for Earth.


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