A 30-year-old man collapsed and died at a Tehran bodybuilding club after ingesting a sports supplement that, according to Iranian forensic authorities, had been laced with cyanide. The victim, identified in local media reports as Behnam, was pronounced dead at the scene in early November 2024. A post-mortem examination and toxicology analysis confirmed the presence of the poison in the powder, which the gym manager stated Behnam had brought from home.

Investigators from the Tehran Criminal Court determined that Behnam and his wife, Shahla, had been in conflict, and that Shahla was conducting a clandestine relationship with another man. Police subsequently arrested Shahla and a hospital employee named Amir, who is alleged to have supplied the cyanide. According to a statement attributed to Amir by Iranian news outlets, he met Shahla when she visited his workplace for medical treatment. He claimed she told him she held a Schengen visa and had married Behnam only temporarily, but that her husband was preventing her from leaving the country. Amir further alleged that Shahla had previously considered killing Behnam by tampering with a gas hose or using aluminium phosphide tablets, before asking him to procure cyanide to mix into the supplement. Shahla has denied involvement in the killing, despite what authorities describe as forensic and witness evidence. Both have been indicted: Shahla on a charge of causing death and Amir for complicity in murder.

The case, as reported by multiple Persian-language outlets, unfolds against a backdrop of psychological research into infidelity and relationship insecurity. A study by researchers at the University of New Brunswick, published recently, found that attraction to someone outside a primary relationship is common but does not inevitably lead to infidelity; rather, it often reflects pre-existing dissatisfaction or unmet emotional needs. The study, which tracked 542 adults in exclusive relationships, noted that a deteriorating bond increased the desire to be unfaithful and raised the risk of separation. Separately, a US lifestyle survey indicated that 16 per cent of partnered Americans have identified a person for whom they would consider leaving their current relationship, with men more likely than women to report such an alternative.

Psychologists consulted by Spanish-language media observe that repeated demands for verbal reassurance—such as constantly asking a partner “Do you love me?”—can signal an anxious attachment style or unresolved emotional wounds from past abandonments. While such behaviour may stem from a need for validation, specialists warn it can become problematic when the reassurance never suffices. In a parallel illustration of trust corroded by suspicion, a 24-year-old woman described on a social media platform how discovering sildenafil in her boyfriend’s luggage, combined with his prolonged absences and a year-long cessation of sexual intimacy, led her to conclude he was likely leading a double life. Commenters on the post speculated the man might be married or in another long-term relationship.

The Tehran criminal investigation remains active, with the indictments issued by the magistrate of the second branch of the capital’s criminal court. No trial date has been set, and the accused maintain differing accounts of the events. The case continues to draw attention to the extreme consequences that can arise when hidden relationships and domestic discord intersect.