The murder of Betsy Aardsma is an American murder case dating from November 1969, in which a 22-year-old graduate student was murdered by a single stab wound inside the Pattee Library at the Pennsylvania State University (Penn State) in University Park, Pennsylvania.

Though Aardsma's murder remains officially unsolved, local investigative journalists and two independent authors have published testimony and reports which strongly indicate Penn State geology professor Richard Haefner may have been responsible for her death, which has been described by one author as Pennsylvania's most infamous unsolved murder. The evidence indicating Haefner's guilt of Aardsma's murder is circumstantial. Haefner was never charged with her murder, and died in 2002.

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