The two persons have been identified as Rakesh Khatri (32), a gym trainer by profession, and Arun Chauhan (22).
On February 21, they had an argument with the Hardeep Singh (the victim), editor of a journal who had earlier worked as a video editor for a Hindi news channel, over playing of loud music, following which they allegedly shot Singh dead, police said.
Singh had objected to playing of music loudly.
Based on a tip-off, the duo were arrested yesterday. During interrogation, they confessed to the crime and told police that Khatri had planned to kill his girlfriend for which they had bought a gun, with which they allegedly shot dead Singh after the heated argument on February 21.