← Back to Thailand casesSiri Porn Kanwong, Nipa Sainchan, and others Allegedly Murdered by Sararat Rang Siwutapon and Tanicaa Xuanwat, Ratchaburi, Thailand
Case Summary
In April 2023, Siri Porn Kanwong (Koi), a 32-year-old woman, died suddenly during a Buddhist ritual at Maeklong River in Ratchaburi, Thailand. Initially suspected as a heart attack, her death was later confirmed as cyanide poisoning. Her close friend Sararat Rang Siwutapon (AM), wife of a high-ranking police officer, was implicated in a series of cyanide poisonings targeting acquaintances to seize their assets. Evidence included CCTV footage, autopsy results, cyanide found in AM's possession, and witness testimonies. AM was arrested and later convicted of multiple murders, including Koi's, and sentenced to death and life imprisonment for other cases. AM's ex-husband and lawyer were also convicted for aiding in evidence concealment and asset management. The case revealed AM's gambling addiction and financial desperation as motives.
Basic Information
Country: Thailand
State/Province: None
City/Region: Ratchaburi
Incident Type: Murder
Relationship Status: Married
Relationship Duration:
Incident Date: April 14, 2023
Incident Sequence and Additional Victims
Primary reported outcome: Homicide
Reported self-harm outcome: No suicide or attempt reported
Reported sequence: Order not reported / unclear
Additional victims reported: 7
Additional victim events:
- Nipa Sainchan — Family or household member; Killed; Order not reported / unclear
- Surat Torap — Unclear / not reported; Killed; Order not reported / unclear
- Kandator — Unclear / not reported; Killed; Order not reported / unclear
- Other 3 victims — Unclear / not reported; Killed; Order not reported / unclear
Relationship Journey
Relationship Origins:
- Friends circle
Relationship Stages:
- Married Living Together
Analysis
Contributing Factors:
- Cheating / Infidelity
- Financial Issues
- Divorce / Separation
Red Flags:
- Financial secrecy
- Discovery of hidden calls or messages
- Escalation Pattern / Violence
- Threats
- Divorce Pending / Recent Separation
Motives:
- Money / Financial Gain
- Avoid divorce settlement
- Control/domination
Relationship Outcomes:
- Divorce filed
- Divorce finalized
- Legal case ongoing
- Homicide during marriage
- Arrest made
- Weapon recovery
- Deadbody recovery
People Link Graph
Relationship Journey Graph
Origin
- Friends circle
How the relationship or connection began.
Status
- Married
Stages
- Married Living Together
Important relationship phases recorded for this case.
Warning Signals
- Financial secrecy
- Discovery of hidden calls or messages
- Escalation Pattern / Violence
- Threats
- Divorce Pending / Recent Separation
Reported red flags or early concern points.
Pressure Points
- Cheating / Infidelity
- Financial Issues
- Divorce / Separation
- Money / Financial Gain
- Avoid divorce settlement
- Control/domination
Contributing factors and possible motives from the available sources.
Incident
2023-04-14
Outcome
- Divorce filed
- Divorce finalized
- Legal case ongoing
- Homicide during marriage
- Arrest made
- Weapon recovery
- Deadbody recovery
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Siri Porn Kanwong, Nipa Sainchan, and others Allegedly Murdered by Sararat Rang Siwutapon and Tanicaa Xuanwat, Ratchaburi, Thailand
Nadia Omara - Indonesia · Original language: English
View original title
KASUS PALING MENGGEGERKAN THAILAND - THE THAI CYANIDE KILLER
AI Intelligence Assessment
Relationship Pattern
Jealousy
Pattern Analysis
The case involves a pattern of betrayal and murder within close personal relationships, where the suspect, AM, exploited trust to poison victims with cyanide for financial gain. The involvement of family and close friends, combined with AM's marital and financial troubles, reflects a complex dynamic of control, deception, and escalating violence.
Investigative Notes
Investigation relied on autopsy results confirming cyanide poisoning, CCTV footage placing AM at crime scenes, witness testimonies including a survivor, and financial transaction records. Arrest warrant issued after evidence collection. Subsequent convictions of AM, her ex-husband, and lawyer for related crimes. Some cases remain under investigation or were acquitted due to insufficient evidence.
Investigation Confusion
Initial death recorded as heart attack; police initially hesitant to suspect homicide due to AM's police connections. Conflicting statements from AM about presence at crime scenes caused confusion. Some victims' bodies cremated, limiting forensic confirmation. Acquittal in one case due to lack of evidence.
Case Reconstruction / Puzzle Pieces
Koi died during a ritual after cyanide poisoning administered by AM, who was present despite denying it. AM stole valuables and fled scene. Family suspicion led to evidence gathering including CCTV and social media posts. Police investigation confirmed cyanide presence and linked AM to multiple similar deaths dating back to 2015. Financial motives and gambling debts uncovered. AM's ex-husband and lawyer aided in concealing evidence and managing stolen assets. Legal proceedings resulted in multiple convictions and sentences.
Risk Assessment
High risk due to repeated use of poison within trusted relationships, financial desperation, and involvement of accomplices. The suspect's access to victims and ability to conceal crimes over years indicates significant threat potential.
Key Takeaways
Trust within close relationships can be exploited for financial gain leading to lethal outcomes. Early family suspicion and independent evidence gathering were crucial. Cyanide poisoning as a method can be difficult to detect without thorough forensic investigation. The involvement of law enforcement family members complicates investigations. Financial desperation and addiction can drive extreme criminal behavior.
AI Case Q&A
What early signals mattered most?
Missing valuables immediately after death, inconsistent statements by close friend AM, and unusual behavior at the scene.
Which clues helped connect the case?
CCTV footage showing AM at the scene and handling victim's belongings, chat history proving AM's presence, and witness testimony of AM driving victim's car.
Which evidence types appeared strongest?
Autopsy results confirming cyanide poisoning, cyanide found in AM's car and home, CCTV recordings, financial transaction records, and survivor testimony.
Witness / Eyewitness Statements
Witnesses reported seeing AM at the scene, acting suspiciously, and not assisting victims. Survivor Pla testified about cyanide poisoning and AM's refusal to help. Family members provided chat histories and observations of AM's behavior.
How did follow-up reports change the understanding?
Follow-up reports expanded the number of suspected victims to 14, revealed AM's gambling addiction and financial motives, and led to convictions of AM, her ex-husband, and lawyer. Some cases remain unresolved or acquitted.
What remained unclear?
Exact details of all victims and full extent of AM's accomplices remain unclear. Some cases lack sufficient evidence for conviction.