The incident was reported from south Delhi's Sangam Vihar.
On January 5, Deepak had gone to Neb Sarai to attend his friend's birthday party but did not return home, following which his family lodged a complaint, the police said.
His body was recovered from a drain in the area and subsequently, the police apprehended a juvenile and his friend.
The accused told police that they had taken Kanwars during a yatra in August, and a Deepak was a member of the group.
The juvenile was nursing a grudge and got the opportunity to exact revenge on January 5, the police said.
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