A woman and her paramour were arrested here for allegedly killing her husband, police said on Friday.
Golu Yadav alias Gonu Yadav, 22, was shot seven times by unidentified assailants near Pataudi, some 28 km from here, on April 29.
Besides Golu Yadav's wife Priyanka and her paramour Arun Yadav, police arrested Arun Yadav's friend Arun Kumar and Lalit Kumar in connection with the case.
Arun Yadav is the brother-in-law of Priyanka's elder sister. Arun Kumar introduced Arun Yadav to Lalit Kumar, who arranged the contract killers.
Golu Yadav married Priyanka in May last year. Priyanka's father Anoop Yadav is Gurgaon councillor.
"Priyanka and Arun Yadav had an affair. Priyanka hatched the plot to murder Gonu Yadav with her paramour. They hired contract killers from Uttar Pradesh's Mainpuri and killed Golu Yadav," crime branch officer Yashwant Singh told IANS.
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"The accused were arrested on the basis of technical evidence. Some CCTV footage near the crime spot also helped us to solve the murder," Singh said.
The four were produced in a district court in Gurgaon on Friday.
Priyanka was sent to judicial custody while the other three were sent to three days police remand, the officer added.
The contract killers are yet to be nabbed.