Cyanide Mohan: The Teacher Who Killed With a Promise

To the people of his town, he was the most ordinary kind of trustworthy: a former schoolteacher, soft-spoken and respectable, the sort of man families are relieved when their daughters meet. To at least twenty women, he was the last person they ever trusted, and the reason their families spent years not knowing what had happened to them.

Mohan Kumar earned the name Cyanide Mohan, and his case is one of the most disturbing in modern Indian crime precisely because of how little he had to do to kill. He did not need violence, or strength, or even a weapon in the usual sense. He needed only a promise, a pill, and a society whose pressures did much of his work for him.

The respectable double life

Mohan Kumar was a former primary-school teacher from the Bantwal area of Dakshina Kannada district in Karnataka. Educated, articulate and personable, he maintained the image of a decent, dependable man even as he led a second, hidden life. That respectability was not incidental to his crimes; it was the engine of them.

A schoolteacher occupies a place of unusual trust in a community. Parents hand him their children; neighbours assume his good character. Mohan understood the value of that reputation and spent it carefully, using the credibility it gave him to approach women and their families without raising the slightest alarm.

He chose his victims with cold precision. They were typically unmarried women, often from poor families, who were under intense social pressure to marry but unable to afford a dowry or to find a suitable husband. He approached them through matrimonial connections and acquaintances, sometimes using false names and posing as a government officer to deepen their trust and to make his promise of marriage seem like a genuine escape from their predicament.

A promise turned into poison

Mohan's method exploited both hope and shame. He would offer marriage, draw the women into a relationship, and then, on the pretext of preventing pregnancy before the wedding, give them what he said were contraceptive pills. The tablets were laced with potassium cyanide.

The setting he chose for the killings was as deliberate as the disguise. He would lead his victims to the restrooms of bus stations, anonymous, transient places where a woman could die without a single person who knew her nearby. The poison acted fast. Afterwards, he took her jewellery and any money she carried, and vanished back into his respectable life, leaving a body in a public toilet far from anyone who could name her.

For years, the system failed to see the pattern. Several of the deaths were recorded as suicides, in some cases even when post-mortem examinations detected traces of cyanide. A young woman found dead in a bus-stand restroom, far from home, was too easily dismissed as a tragedy of shame or despair rather than the scene of a murder. That institutional blind spot, the readiness to write off a poor woman's death, was as much a part of his method as the poison itself.

The case that unravelled him

The thread that finally pulled the whole pattern apart ran through the case of a woman he had contacted under a false name. When she went missing, investigators began examining mobile-phone call records, and those records pointed not to one disappearance but to a web of contacts with other women who had also vanished or died in similar circumstances.

The single death became a series, and the series pointed to one man. Mohan Kumar was arrested in October 2009. When police searched him, they recovered cyanide, multiple mobile phones, and jewellery belonging to a victim, physical evidence that tied the respectable former teacher directly to the deaths. With his arrest, investigators reopened a long list of unexplained deaths and missing-person cases across coastal Karnataka and neighbouring areas, many of which had been quietly filed away as suicides.

The reinvestigation revealed how effective his camouflage had been. Deaths that had been treated as isolated tragedies, scattered across different places and years, now resolved into a single, chilling pattern authored by one patient predator.

Justice, in instalments

A fast-track court ultimately tried and convicted him in connection with the murders of around twenty women. He was initially sentenced to death, a sentence later commuted to life imprisonment, and he was convicted across multiple separate cases as the prosecutions proceeded one by one. He remains in prison, serving a life term.

The piecemeal nature of his convictions reflects the sheer scale of the case. Each victim was a separate investigation, a separate trial, a separate family seeking answers, all tracing back to the same quiet, smiling man. The legal process had to reassemble, case by case, a crime that he had deliberately scattered across geography and time to keep it from ever being seen whole.

Why this case still matters

Cyanide Mohan is a study in how a predator hides behind respectability. He looked exactly like the kind of man a family would welcome, and he used that image as a weapon. The lesson is not that teachers are dangerous, but that danger rarely announces itself, and that surface respectability is no protection at all, and can in fact be the perfect disguise.

The case also exposes a deeper social wound. Mohan deliberately targeted women cornered by the pressures of marriage and dowry, women whose desperation to secure a future made them vulnerable to a man promising one. His crimes were personal, but the conditions he exploited were not. They were built into the world his victims were forced to navigate, a world in which an unmarried woman without means could feel she had no good options left.

Finally, the case is an indictment of how easily the deaths of poor women were dismissed. Had the early victims' deaths been investigated rather than written off as suicides, the pattern might have emerged years sooner. The same social invisibility that made the women vulnerable in life followed them into death, and it was that indifference, as much as Mohan's cunning, that allowed him to keep killing.

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Frequently Asked Questions

Why was he called Cyanide Mohan?

The nickname came from his method of killing. He poisoned his victims with potassium cyanide, which he disguised as contraceptive pills, earning him the name Cyanide Mohan in the press.

How did Cyanide Mohan lure his victims?

He targeted unmarried women, often poor and under pressure to marry, and offered them marriage, sometimes using false names or posing as a government officer. He then gave them cyanide tablets disguised as contraceptive pills, often leading them to isolated bus-station restrooms.

How was he finally caught?

Investigators examining the case of a missing woman traced his mobile-phone call records, which linked him to a series of other women who had died or disappeared. He was arrested in October 2009 with cyanide, multiple phones, and a victim's jewellery in his possession.

How many women did Cyanide Mohan kill, and what was his sentence?

He was convicted in connection with the murders of around twenty women, killed between roughly 2003 and 2009. He was initially sentenced to death, which was later commuted to life imprisonment.

Sources: Karnataka court records and contemporary national press reports. The exact number of victims and the timeline vary slightly across accounts; he was convicted in connection with around twenty murders.