Thales Naves Alves Machado, a government secretary in Itumbiara, Goiás, Brazil, allegedly killed his two sons, Miguel (12) and Benicio (8), after discovering his wife Sarah Tinoco's infidelity through a private detective's video evidence. The incident occurred on February 12, 2026. Thales had previously posted an AI-generated image portraying a perfect family, which was a facade masking his private turmoil. After confirming the infidelity, he shot his sons and then committed suicide. Benicio initially survived but died the following day due to injuries. The case is an example of extreme vicarious violence, where the father used his children to punish his wife. The legal case closed with the perpetrator's death, and no trial will occur.
Country: Brazil
State/Province: Goiás, Brazil
City/Region: Itumbiara
Incident Type: Family Homicide
Relationship Status: Married
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Incident Date: Feb. 12, 2026
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How the relationship or connection began.
Important relationship phases recorded for this case.
Reported red flags or early concern points.
Contributing factors and possible motives from the available sources.
2026-02-12
Recorded relationship or case outcome.
English labels are shown first. Original-language titles are preserved for source verification.
Relator Forense - Colombia · Original language: Spanish
ENGAÑÓ a su ESPOSO y Él HIZO lo PEOR con sus HIJOS #crimestory #ThalesNeves
Jealousy
The case exemplifies extreme vicarious violence driven by jealousy and control. The offender, a narcissistic husband, reacted to his wife's infidelity by killing their children to punish her, demonstrating a pattern of coercive control and emotional abuse culminating in filicide and suicide.
The investigation confirmed the offender's suicide at the scene and the deaths of both children. The private detective's video evidence was pivotal. The legal case closed due to the perpetrator's death, with no trial. Public discourse included victim-blaming of the wife, which was refuted by forensic analysis emphasizing the offender's sole responsibility.
No confusion reported regarding suspect identification; the perpetrator died by suicide at the scene. Some societal blame was misdirected at the wife, but official findings clarify responsibility.
Thales Naves Alves Machado posted an AI-generated family image on February 11, 2026, masking private turmoil. He hired a private detective to confirm his wife's infidelity in São Paulo. Upon receiving video evidence, he experienced a narcissistic injury and humiliation. On February 12, he shot his sons while they slept, killing Miguel instantly and critically injuring Benicio, then committed suicide. Benicio died the next day in hospital. The case illustrates a calculated act of vicarious violence to punish the wife.
High risk due to narcissistic traits, controlling behavior, and access to firearms combined with confirmed infidelity and emotional humiliation.
Public facades can mask private chaos; narcissistic injury and control issues can escalate to extreme violence; infidelity is a civil matter, but violent retaliation is criminal; early detection of controlling and manipulative behavior is critical.
The hiring of a private detective and the obsessive monitoring of the wife were key early signals of escalating control and suspicion.
The private detective's video evidence confirming infidelity was the critical clue that triggered the violent act.
Video surveillance from the private detective and forensic autopsy reports were the strongest evidence.
Not reported.
No follow-up reports beyond the death of the younger son and closure of the legal case due to the perpetrator's death.
Exact duration of the marriage and prior history of domestic conflict remain unclear.