Key facts
- Name: Diane Yayoe Suzuki
- Born: May 14, 1966
- Age at disappearance: 19
- Last seen: July 6, 1985, ~5:00 p.m.
- Location: Outside the Rosalie Woodson Dance Academy, Aiea, Oahu, Hawaii
- Height / build: 4’11”, 109 lbs; Japanese descent; black hair, brown eyes
- Status: Still missing — Honolulu Police Department, open investigation
- Investigating agency: Honolulu Police Department
Five o’clock at the dance academy
On the afternoon of July 6, 1985, 19-year-old Diane Suzuki finished her day at the Rosalie Woodson Dance Academy in Aiea, Oahu, where she worked part-time as a dance instructor while studying at the University of Hawaii at Manoa. She lived in nearby Halawa. She was 4’11” and 109 pounds.
At about 5:00 p.m., outside the academy, Diane vanished.
What investigators found at the scene changed Hawaiian law enforcement: blood evidence, and the first-ever use of luminol by the Honolulu Police Department — the chemical that makes blood glow in the dark. The luminol lit up what the eye couldn’t see. But it couldn’t say where Diane had gone.
She has been missing for 41 years.
The Strangler summer
Diane disappeared in the middle of the Honolulu Strangler era — the unsolved murders of young women, including Lisa Au and Regina Sakamoto, that terrorized Oahu in the mid-1980s. For a time, investigators had to consider whether Diane was another victim of the same killer. She didn’t fit the profile — the Strangler’s victims were found; Diane was not — but the fear was real, and it shaped the early investigation.
In 1993, Honolulu prosecutor Keith Kaneshiro reopened Diane’s case. More than 300 hours of grand-jury testimony were heard. No charges were ever filed.
Diane’s case is sometimes credited with spurring an overhaul of Hawaii’s stalking laws in the 1990s; the specific legal details of that claim could not be verified from primary sources. A young woman’s disappearance may have rewrote the statutes — but the claim remains unconfirmed.
Her parents, Yuri and Masaharu Suzuki, spent the rest of their lives without an answer. Both have since died. Retired HPD major Gary A. Dias’s memoir Honolulu Cop: Reflections on a Career with HPD is sometimes cited as covering the parallel investigations of Lisa Au and Diane Suzuki — the claim that it names a former boyfriend as the likely killer could not be independently verified from accessible sources.
Diane would be 60 years old today.
Theories: what might have happened
Abduction and homicide. The theory the physical evidence supports: blood at the scene, the first luminol deployment in HPD history, a 19-year-old who vanished from a fixed location at a fixed time and never contacted anyone again. The 300+ hours of grand-jury testimony in 1993 suggest investigators had a direction — but testimony without charges is suspicion, not proof.
The Honolulu Strangler. Considered and largely set aside: Diane didn’t fit the victim profile, and unlike the Strangler’s victims, she was never found. It remains a possibility that can’t be fully excluded, but investigators moved past it.
Voluntary disappearance. Nothing supports this: a 19-year-old with a job, university studies, and a family she was close to, gone without a word for 41 years, with blood at the last place she was seen.
Have information?
Contact the Honolulu Police Department at (808) 529-3111. In an emergency, dial 911.
Timeline
- May 14, 1966 — Diane Yayoe Suzuki is born.
- 1985 — Diane studies at UH Manoa and teaches part-time at the Rosalie Woodson Dance Academy, Aiea.
- July 6, 1985, ~5:00 p.m. — Last seen outside the dance academy. Blood evidence found; HPD uses luminol for the first time.
- Mid-1980s — Honolulu Strangler murders (incl. Lisa Au, Regina Sakamoto) investigated as a possible link; Diane doesn’t fit the profile.
- 1993 — Prosecutor Keith Kaneshiro reopens the case; 300+ hours of grand-jury testimony; no charges.
- 1990s — Hawaii overhauls its stalking laws; the case is sometimes credited as a catalyst, though the specific details could not be verified from primary sources.
- 2000s–2020s — Parents Yuri and Masaharu Suzuki die without answers.
- Today — Still missing. Case open with Honolulu Police Department.
FAQ
Is Diane Suzuki still missing?
Yes. As of October 2026, Diane Suzuki has been missing for 41 years. Her case remains open with the Honolulu Police Department.
Was Diane Suzuki ever found?
No. Neither Diane nor her remains have ever been found.
Was Diane Suzuki a victim of the Honolulu Strangler?
Investigators considered it, but she didn’t fit the killer’s victim profile — the Strangler’s victims were found, while Diane was not. The link was never established.
How old would Diane Suzuki be today?
Diane was born May 14, 1966. She turned 60 in May 2026.
What is the luminol significance in Diane Suzuki’s case?
Her disappearance marked the first time the Honolulu Police Department ever used luminol — the chemical that reveals blood traces invisible to the naked eye — at a crime scene.
How can I help?
Share this case file. If you have any information, contact the Honolulu Police Department at (808) 529-3111.
Sources
- Official / law enforcement: Honolulu Police Department (808-529-3111).
- News: Honolulu Star-Advertiser coverage of the Suzuki case; Honolulu Star-Bulletin archives (1985–1993).
- Reference: Wikipedia, “Disappearance of Diane Suzuki”; The Charley Project; NamUs.
- Media: Gary Dias, Honolulu Cop (book covering the Au and Suzuki investigations).
Corrections (October 2026 fact-check): The claim that Diane’s case drove a specific stalking-law overhaul (TRO violation becoming a class C felony) could not be verified from primary sources — softened to note the case is “sometimes credited” as a catalyst. The claim that Gary Dias’s “Honolulu Cop” names a former boyfriend as the likely killer could not be independently verified — attributed accordingly.
Found an error? Tell us via the About page and we will fix it promptly and note the change here. Last verified October 2026.