He confessed to the murders of 20 young girls over a period of 5 years. His modus operandi was to lure unmarried young girls into marrying him. The next day after marriage, he would kill them by giving them cyanide stating it was an anti-pregnancy pill.  

He is also known as Cyanide Mohan. The victims — including Anitha — were given cyanide in pills that Mohan told them were contraceptives.

The case has been taking curious turns ever since the 2009 murder of Anitha. To begin with, the Hassan city police suspected the girl had been crossed in love and taken her life.