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Solved case · 1986

Murder of Sherry Ann Duncan

Also known as Sherry Ann Duncan's murder · Sherry Ann Duncan's killing

SOLVEDACQUITTED
Updated
Updated Jul 7, 2026
Bangkok, Thailand (body found in Samut Prakan Province)View on the map

The short answer

Murder of Sherry Ann Duncan in brief

Sherry Ann Duncan, a 16-year-old student, was abducted and murdered in Bangkok in 1986. Four men were wrongly convicted and sentenced to death before being acquitted in 1995 after evidence emerged of false testimony and coerced confessions; two other men were later convicted of the actual murder.

Key facts

Year
1986
Place
Bangkok, Thailand (body found in Samut Prakan Province)
Status
SOLVEDSolved
Victim
Sherry Ann Duncan
Outcome
Acquitted: Suwiboon Patpongpanit

The coverage index

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The case file

What happened

Sherry Ann Duncan, a sixteen-year-old half-Thai/American student, was abducted after leaving her school in Bangkok on 22 July 1986. Her body was found a few days later in wetlands in Samut Prakan Province. The case became a sensational crime story in Thailand.

In the initial investigation, four men were arrested and eventually convicted of her murder, receiving death sentences in 1990. However, later re-investigations by the Crime Suppression Division uncovered evidence that a key witness had given false testimony and that the four men had been coerced into making confessions under duress. The Supreme Court overturned their convictions in 1995. By the time of the acquittal, the wrongful prosecution had already caused severe harm: one of the wrongly accused men had died in prison, another sustained permanent spinal injuries from beatings by police intended to coerce a confession, and a third died of tuberculosis shortly after his release.

Following the exoneration, two other men were arrested and convicted for the murder. These men implicated Suwiboon Patpongpanit, the daughter of Udom Patpongpanit, described as Thailand's red light district czar, alleging she had hired them to commit the crime. Suwiboon Patpongpanit was convicted by the Court of First Instance, but the Supreme Court acquitted her in 1999, citing insufficient evidence.

Police Colonel Mongkol Sripho, who had led the original investigation, was retroactively dishonourably discharged for fabricating evidence. By the time this action was taken, he had already retired and emigrated to the United States, and he was not brought to face criminal charges over the fabricated evidence.

In 2003, the Civil Court awarded 26 million baht in damages to the wrongly convicted men and/or their descendants, in recognition of the harm caused by their false imprisonment. The case has since been frequently cited in Thailand as an example of police corruption and broader problems within the country's justice system. It was later adapted into a film titled Sherry Ann, directed by Charoon Wattanasin and produced by Five Star Production in 2001.

7 dated entries · 1986–2003

Timeline

  1. Sherry Ann Duncan is abducted after leaving her school in Bangkok.

  2. Duncan's body is found in wetlands in Samut Prakan Province; four men are arrested in connection with the murder.

  3. The four arrested men are convicted of murder and sentenced to death.

  4. The Supreme Court overturns the convictions of the four men after re-investigation reveals false testimony and coerced confessions.

  5. The Supreme Court acquits Suwiboon Patpongpanit, overturning her earlier conviction by the Court of First Instance, citing insufficient evidence.

  6. A film based on the case, titled Sherry Ann and directed by Charoon Wattanasin, is released by Five Star Production.

  7. The Civil Court awards 26 million baht in damages to the wrongly convicted men and/or their descendants.

3 named in this file

People

Victims first. Every legal label is set from public records and court outcomes, not from the prose.

  • Sherry Ann Duncan

    VICTIM

    16-year-old half-Thai/American student abducted and murdered in Bangkok in 1986.[3]

  • Suwiboon Patpongpanit

    ACQUITTED

    Convicted by the Court of First Instance of hiring men to commit the murder; acquitted by the Supreme Court in 1999 due to insufficient evidence.[3]

  • Mongkol Sripho

    LAW ENFORCEMENT

    Police Colonel who led the original investigation; retroactively dishonourably discharged for fabricating evidence, but not criminally charged as he had already retired and emigrated to the United States.[3]

3 cited

Sources

Coverage is not a source: every fact in this file rests on the records below.

  • 2 Press
  • 1 Encyclopedic
  1. Contemporaneous coverage — matichonweekly.com

    Pressmatichonweekly.comAccessed Jul 7, 2026

  2. Contemporaneous coverage — bangkokpost.com

    Pressbangkokpost.comAccessed Jul 7, 2026

  3. Murder of Sherry Ann Duncan

    EncyclopedicWikipediaAccessed Jul 7, 2026

Trust

Record history

First published
Jul 7, 2026
Corrections
None

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