Who Killed Sigrid Stevenson?

In 1977, a young graduate student was found naked and beaten on the main stage in the campus theatre. With little to go on, the case quickly turned cold, and despite numerous reopenings over the decades, we still have no answers. 
Can you solve this mystery?

If you have any information about the murder of Sigrid Stevenson in September of 1977, please contact the Ewing Police Department at 609-882-1313.

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Sources:
https://repository.uclawsf.edu/cgi/viewcontent.cgi?article=3326&context=hastings_law_journal