The boy was allegedly killed by his neighbour as he felt insulted when the victim's parents admonished him for staying outside their house, police said.
Confirming the incident, Atul Kumar Thakur, Deputy Commissioner of Police (northeast), said the accused, identified as Danish, has been arrested from his house in the Nehru Vihar area.
He used to deal in sale of live chicken and his house is adjacent to victim's house, the officer said.
During investigation, Danish was seen walking down a lane with the boy in a CCTV footage. The date and time of the CCTV footage was matched with the missing compliant of the child, Thakur said.
On Saturday, Danish was held for questioning and he confessed that he killed the boy because he felt insulted after his parents scolded him for staying in front of their house, the DCP said.
He held a grudge against the family and wanted to teach them a lesson, Thakur added.
On May 14, he allegedly took the boy to an isolated spot under the Khajuri flyover, almost four kilometres from his house, after luring him to offer chocolate, the DCP said.
He strangulated him and later dumped the body under the flyover, the officer said.
The boy's parents, who work as labourers, when returned from their workplace found that their son was missing, and subsequently filed a missing complaint at Khajuri Khas police station, Thakur said.
Danish shared a friendly relation with the boy. He even had gifted a few chicks to him, he said.
Police are also looking if the boy was sexually assaulted before being killed, Thakur said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)