Heiress to Barney Quill's estate and secret illegitimate daughter. Initially suspected of being the victim's mistress, she later testifies about discovering the missing underwear in the laundry room. Her revelation that Quill was her father shocks the court, and she hires Biegler to manage the estate post-trial.
Mary's evidence indirectly aids Laura's case.
Mary's testimony is pivotal to Manion's legal outcome.
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