Disclaimer: This article contains mentions of murder and assault. Readers are advised to exercise caution.

The Unsolved Mysteries episode "Murder, Center Stage" reexamines the 1977 murder of Sigrid Stevenson at Trenton State College. The institution is now called The College of New Jersey. The fourth episode of volume 4 attempts to find answers to the decades-old mystery of who killed Sigrid Stevenson. Sigrid, a 25-year-old graduate student and pianist, was reportedly found dead on the institution's Kendall Hall stage.

Sigrid Stevenson died of blunt force trauma after the killer repeatedly struck her in the head. Other marks on the victim's body suggested the killer had handcuffed her and also sexually assaulted her. Authorities found no other evidence at the crime scene, but believed a campus security guard could have committed the crime.

The Unsolved Mysteries episode about the murder of Sigrid Stevenson delves into the details and theories of the case. Here's what you need to know.