In 1969, Betsy Aardsma was murdered in the library at Penn State University. The case remains unsolved, but the identity of her killer may exist in the pages of a book called “Murder In The Stacks: Penn State, Betsy Aardsma, and the Killer Who Got Away.” Featuring author David DeKok.

- - - Sources - - -
“Murder In The Stacks: Penn State, Betsy Aardsma, and the Killer Who Got Away” by David DeKok

“Murder in the Stacks: 50 years later, still no answers.” by Erin Hogge
https://www.collegian.psu.edu/news/campus/murder-in-the-stacks-50-years-later-still-no-answers/article_b6280ed6-1a18-11ea-a966-2b1ac6ebcdcb.html

"2 Authors peg lancaster native as mystery murderer of 19 year old...Betsy Aardsma"
https://lancasteronline.com/news/2-authors-peg-lancaster-native-as-mystery-murderer-of-19-year-old-penn-state-student/article_8f21c2e9-fbfc-5e28-aa5b-f93e046975bc.html

"Author David DeKok discusses Penn State's infamous 'Murder in the Stacks': A live chat recap" by Gary Dwight Miller
https://www.pennlive.com/midstate/2014/08/author_david_dekok_a_live_chat.html

"‘Murder in the Stacks’: 45-year-old Betsy Aardsma case intrigues author David DeKok" by Jason Klose
https://www.centredaily.com/living/article42872370.html

"Author, talking in Emmaus, talks about who murdered Betsey at Penn State" by Margie Peterson
https://www.mcall.com/entertainment/mc-murder-stacks-penn-state-dave-dekok-2-20150413-story.html

"The West Michigan Woman At The Heart Of..." by Eric Meier
https://k1025.com/betsy-aardsma/

"MYSTERY KILLING The chilling unsolved murder of Betsy Aardsma who was butchered in her university library… and the two main suspects have never been tracked down" by Lauren Windlehttps://www.thesun.co.uk/fabulous/4514592/chilling-unsolved-murder-betsy-aardsma/