Sagar Sharma (28) was returning home when assailants shot at him. He was taken to a hospital where he succumbed to his injures.
The main accused, Deepak Verma, was arrested near Salarpur underpass from a bus, Farmooq Ali, SHO Dankaur police station, said.
He tried to run away but was nabbed by the police, he added.
Another accused in the murder case was arrested yesterday.
During interrogation, Verma confessed to have killed Sagar following an altercation and said he was in an inebriated state at that time, Ali said.
Following the killing of Sagar, the Dankaur traders had closed their shops demanding arrest of the culprits.