← Back to South Korea casesMs. Choi Murdered by Ms. Oh and Mr. Park, Songpa-gu, South Korea
Case Summary
On January 22, 2015, Ms. Choi was found collapsed and unconscious in her home in Songpa-gu. She was later confirmed to have died from cyanide poisoning. The investigation revealed that Ms. Oh, the husband's mistress, had administered cyanide to Ms. Choi by contaminating soju. Ms. Oh was arrested and later sentenced to life imprisonment. The case involved a complex love triangle, infidelity, and a financial settlement that failed to end the affair. The husband, Mr. Park, was involved in an extramarital relationship with Ms. Oh, which was known to the victim's family. The murder was meticulously planned, including attempts to avoid CCTV detection and conceal evidence.
Basic Information
Country: South Korea
State/Province: None
City/Region: Songpa-gu
Incident Type: Murder
Relationship Status: Married
Relationship Duration: 17 years
Incident Date: Jan. 22, 2015
Relationship Journey
Relationship Origins:
- Met at Workplace
- Family introduction
- Arranged marriage
Relationship Stages:
- Married Living Together
- Separated
- Arragned Marriage
Analysis
Contributing Factors:
- Cheating / Infidelity
- Domestic Conflict
- Divorce / Separation
Red Flags:
- Hiding phone
- Financial secrecy
- False accusations of infidelity
- Discovery of hidden calls or messages
- Deception after incident
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Hiding Chat
- Threats
- Stalking / Repeated Harassment
- Divorce Pending / Recent Separation
Motives:
- Revenge
- Avoid divorce settlement
- Jealousy
- Family pressure
- Eliminate romantic rival
Relationship Outcomes:
- Divorce filed
- Legal case ongoing
- Homicide during marriage
- Arrest made
People Link Graph
Relationship Journey Graph
Origin
- Met at Workplace
- Family introduction
- Arranged marriage
How the relationship or connection began.
Status
- Married
17 years
Stages
- Married Living Together
- Separated
- Arragned Marriage
Important relationship phases recorded for this case.
Warning Signals
- Hiding phone
- Financial secrecy
- False accusations of infidelity
- Discovery of hidden calls or messages
- Deception after incident
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Hiding Chat
- Threats
- Stalking / Repeated Harassment
- Divorce Pending / Recent Separation
Reported red flags or early concern points.
Pressure Points
- Cheating / Infidelity
- Domestic Conflict
- Divorce / Separation
- Revenge
- Avoid divorce settlement
- Jealousy
- Family pressure
- Eliminate romantic rival
Contributing factors and possible motives from the available sources.
Incident
2015-01-22
Outcome
- Divorce filed
- Legal case ongoing
- Homicide during marriage
- Arrest made
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Ms. Choi Murdered by Ms. Oh and Mr. Park, Songpa-gu, South Korea
사건의뢰 · Original language: Korean
View original title
밤 12시 소주 한 병을 들고 우리집에 찾아온 남편의 내연녀 l 송파 내연녀 사건 [치정]
AI Intelligence Assessment
Relationship Pattern
Infidelity
Pattern Analysis
The case centers on a long-term marriage disrupted by an extramarital affair. The husband's mistress, Ms. Oh, engaged in a secret affair with Mr. Park, leading to escalating conflict with the wife, Ms. Choi. The affair was exposed multiple times, with financial settlements failing to end the relationship. Jealousy and revenge culminated in a meticulously planned cyanide poisoning murder by the mistress.
Investigative Notes
Police investigation included autopsy confirming cyanide poisoning, CCTV footage analysis showing mistress's suspicious movements, forensic analysis of soju bottle and pillow, seizure of phones and computers for digital evidence, and arrest of Ms. Oh. The husband’s involvement in conspiracy remains under investigation. Ms. Oh was sentenced to life imprisonment after appeal.
Investigation Confusion
Initial suspicion included possible conspiracy between husband and mistress. Ms. Oh denied guilt and blamed Mr. Park. Husband's exact role in murder remains unclear. Some forensic evidence was initially ruled inadmissible but later accepted on appeal.
Case Reconstruction / Puzzle Pieces
On January 21, 2015, Ms. Oh and Ms. Choi were together for about an hour at the victim's apartment. Ms. Oh contaminated soju with cyanide and wiped fingerprints to avoid detection. Ms. Choi ingested cyanide and died between 12:30 a.m. and 4 a.m. Husband Mr. Park was with Ms. Oh earlier that night and called her after finding his wife collapsed. Ms. Oh transported the victim to hospital but did not enter. Police arrested Ms. Oh after tracking her to a temple where she was performing rituals for the victim. Evidence included digital searches on cyanide, purchase attempts, and secret recordings of conversations.
Risk Assessment
High risk due to prolonged infidelity, repeated exposure of the affair, financial disputes, and escalating threats culminating in lethal violence.
Key Takeaways
Infidelity can escalate to lethal violence when combined with jealousy, financial disputes, and obsessive behavior. Meticulous planning and concealment efforts by offenders highlight the importance of forensic and digital evidence. Family awareness of extramarital relationships can intensify conflict. Early intervention in high-conflict relationships may prevent escalation.
AI Case Q&A
What early signals mattered most?
Repeated exposure of the affair, secret recordings by the victim, financial settlements failing to end the relationship, and obsessive behavior by the mistress.
Which clues helped connect the case?
CCTV footage showing mistress's suspicious movements, bloodstained pillow with bite marks, cyanide detected in soju and victim's body, digital evidence of cyanide purchase attempts, and secret phone communications.
Which evidence types appeared strongest?
Autopsy results, forensic analysis of soju bottle and pillow, CCTV recordings, digital forensic data from phones and computers, and witness statements from family and police.
Witness / Eyewitness Statements
Victim's family confronted husband and mistress accusing them of murder. Police statements from interrogations revealed mistress's denial and blame shifting. Hospital medical staff confirmed victim's condition on arrival. Not reported any independent eyewitnesses.
How did follow-up reports change the understanding?
Initial forensic evidence was partially inadmissible in first trial leading to 25-year sentence. On appeal, all evidence was admitted resulting in life imprisonment for Ms. Oh. Husband's involvement remains under investigation.
What remained unclear?
Exact role of husband in conspiracy remains unclear. Whether husband had prior knowledge or involvement in murder is disputed.