Nhan Hau Duc Nguyen was 20 years old and a Lake Forest, California resident when he died on March 28, 1991. Born February 28, 1971, his death was classified as a homicide and investigators treated it as a violent incident.

Authorities conducted interviews and followed leads but were unable to make an arrest, and the case remained unsolved for a long time. Investigators revisited evidence at various points and explored newer forensic techniques in hopes of advances.

The human impact on the local community was significant and the case drew legal and media attention because of the difficulties solving it. Anyone who knew Nhan, his movements in late March 1991, or has information that could help the investigation is asked to come forward.