Fiona Yu was a 21-year-old business senior at Arizona State University when she was attacked and killed on August 4, 1997, in her second-floor off-campus apartment in Tempe, Arizona. She was last seen riding her bicycle nearby between 4:00 and 4:30 p.m. and is believed to have arrived home about 5:00 p.m. Sometime between 5:00 and 5:30 p.m. an unknown assailant sexually assaulted and strangled her; an autopsy confirmed strangulation as the cause of death.

Fiona’s roommate, Kazu Ito, returned to the apartment around 5:15 p.m., stayed on the first floor, then went upstairs about 6:00 p.m. and found Fiona partially clothed and barely alive in the hallway. Emergency services transported her to a hospital, where she died shortly after arrival. There were no signs of forced entry, so investigators considered that the attacker may have been known to Fiona or already inside the apartment.

Detectives examined links to other campus sexual assaults; two teenagers arrested in those cases did not match the DNA from Fiona’s scene. If anyone knew Fiona, saw her that afternoon, or has information about who might have been in her apartment that evening, please come forward.