Police said Dr Ashok Yadav and the victim had done their MBBS from Russia and knew each other for around 10 years and the duo were "good friends."
According to the police, Dr Yadav, a resident of Mayapuri, wanted to marry her and had proposed her on two-three ocassions but she rejected his overture every time.
"He recently came to know that her family members are getting her married. Angry over this, he decided to hatch a plot to teach the victim a lesson. Yadav involved his close friend Vaibhav, who earlier used to work with him," Joint Commissioner of Delhi Police, Tajender Luthra, told reporters here.
Police said Vaibhav had roped in two juveniles and fixed a deal of Rs 25,000 with them to carry out the plot and out of which, Vaibhav gave them Rs 22,000 in advance.
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To ensure a foolproof plan, Dr Yadav had also conducted a trial to make their plot a success
"Yadav wanted to make his plan a success due to which a trial of the attack was executed with the help of accused juveniles. Yadav asked the juveniles to pour water on him by filling it in a syringe as part of the trial," Luthra added.
Police said the victim had trusted Dr Yadav a lot, so much so that when police once took him for interrogation, she told police officials that if they interrogated him, she would withdraw this case.
During the investigation, it came out that the accused (juveniles) had chased the victim from her house. Yadav had initially denied his involvement in the crime but later broke down and confessed to his crime, police said.
The family members of the victim were shocked when "the best friend" of the victim was arrested.