He was identified as Nitin, a law student at a Greater Noida college and a member of the Sunder Bhati gang.
Nitin had taken an advance of Rs 25 lakh through his accomplice Vikas for killing four persons, DSP Arun Kumar Singh said
A country-made pistol and Rs 15,000 cash was recovered from him.
On April 7, he had allegedly killed a salesman at a liquor shop in Tilapta and decamped with cash from the shop.
On 24 March, he had killed one Ankit Bhati outside AVJ Height Society during a robbery.