Before being murdered, management student Anand Tiwari (26) was lured to a pub in Saket by the three accused.
Police said Rahul Chaddha (24), the main accused, had hatched a conspiracy with two friends to kill Tiwari as he had become intimate with his ex-girlfriend.
Police said they also found two eyewitnesses in the case who had seen the accused leaving Saket with the victim.
Tiwari, a student of Indian Institute of Planning and Management (IIPM) was found murdered on May 25 by a morning walker.
Police said Chaddha would also undergo a test identification parade and after that they would take him into custody.
His accomplices were identified as Arjun Acharya (27) and Arun Raghav (26). They are still absconding.
While Acharya worked at the factory of the girl’s father in Ghaziabad, Raghav was a close friend of Chaddha.
During investigations police found that Chaddha and Acharya had threatened Tiwari on earlier occasions as well and asked him to stay away from the girl.