CACrown ArchivesThe cinema collection
Menu
Research dossier · General Reference

Lê Thanh Vân

Vietnamese serial killer

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionMay 10, 2026
Entity authorityQ112571616
Source-derived summary

Lê Thanh Vân (5 December 1956 – 26 October 2005), popularly nicknamed The Cyanide Witch (Phù Thủy Xyanua), was a Vietnamese fraudster and serial killer who, together with her husband and accomplice Dìu Dãnh Quang, poisoned at least 13 people with cyanide from 1998 to 2001 for financial gain. Regarded as the most prolific and infamous serial killer in the country's history, she was convicted, sentenced to death and subsequently executed for her crimes in 2005.

Early life and crimes

Lê Thanh Vân was born on 5 December 1956, in Saigon, South Vietnam, the second in a family of eight children born to a drainage worker and a midwife. Her elder brother died as a child, leading to her being the oldest of the seven remaining siblings. From an early age, Vân had an eccentric and cold personality, was considered unruly, constantly argued with other family members and even beat the family pets. She studied until the 12th grade before dropping out halfway through the term, and in 1975, she enrolled at the Military Medical School of Dentistry. Some time afterwards, she was arrested for attempting to cross the border illegally and was sentenced to 16 months imprisoned at a re-education camp. Following her release, she worked various jobs in order to make a living.

In December 1979, Vân was arrested in District 10 for impersonating an army captain, for which she was sentenced to several months imprisonment. In March 1990, she was arrested in District 5 for a number of forgeries and thefts and imprisoned for 18 months.

Editorial summary

This brief starts where responsible research should: with the source description of “Lê Thanh Vân” as vietnamese serial killer. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA dependable orientation record for establishing vocabulary, names and a first evidence trail. The current lead gives the account dated anchors—1956, 2005, 1998, 2001—that can be checked directly. The linked authority record independently contributes the date 1956-12-05. The account is most persuasive where Thanh, Vietnamese and serial can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as vietnamese serial killer. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated May 10, 2026. The linked authority identifier is Q112571616. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1956, 2005, 1998 and 2001.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “Lê Thanh Vân”, its source revision and the description used here.
  2. Expand the search: follow Lê Thanh Vân primary sources, Lê Thanh Vân archive and Thanh research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Lê Thanh Vân”?
  2. What terminology or title could unlock a more precise catalogue search?
  3. Which cited source is closest to the event, object or claim?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from Lê Thanh Vân” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.