Rajesh, 23, and Vipin, 40, both residents of village Ramchanderpur of Bihar's Lakhisarai district, were arrested yesterday, DCP South District Chhaya Sharma said.
Police had on September 30 recovered the unidentified body of a man with head injuries from a drain in DDA jungle near Samshi Talab in Mehrauli.
The 25-year-old deceased was later identified as Sarvesh Kumar alias Kelu, a resident of village Ramchanderpur.
The deceased was wearing a blue-green T-shirt and a capri. A tattoo of name "Kalim Singh" was engraved on the right arm of the deceased.
Police also found three blood stained-stones and dried blood from the site.
During the probe, police, after going through the call details of the deceased, found that he was last seen with Rajesh, the official said, adding Rajesh was absconding since the day of the incident.