They found her wrapped in the piano cover

Described by those that knew her as quirky and free-spirited, Sigrid Stevenson often traveled by hitchhiking across the US and Canada before arriving in Ewing, NJ. A passionate piano player, she attended then Trenton State College in hopes of becoming a music teacher. Unfortunately, after finding herself sleeping on the couch in the music building, she met the cast of a stage play and stayed to watch their performance. It would be the last time anyone would see her until her cold body was found bludgeoned and wrapped in a piano cover the following night. A case which officially remains unsolved to this day.

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Sources:
https://weirdnj.com/weird-news/murdered-music-major-haunts-college-of-nj-trenton-state/
https://www.nj.com/mercer/2024/09/cold-case-squad-investigating-perplexing-1977-murder-of-nj-grad-student-sources-say.html
https://www.nj.com/mercer/2014/09/unsolved_mystery_37-year-old_tcnj_cold_case_intrigues_filmmaker_who_wants_answers.html
https://www.womanandhome.com/life/news-entertainment/unsolved-mysteries-what-happened-sigrid-stevenson/
https://www.netflix.com/tudum/articles/unsolved-mysteries-volume-4-episode-4-murder-center-stage