Sudhir Kumar's body was recovered from a brick kiln this morning, police said.
One of the accused, Nakul Dev Yadav has been arrested in this connection, they said.
Kumar was allegedly battered to death by Nakul, Raja Babu and Rajkumar last night when he had gone to attend a tilak function in Sonwani village, they said.
During interrogation, Nakul admitted that he had asked Sudhir's sister to have an affair with him and had threatened to kill the boy if she refused, they said.
When the girl refused, Nakul and aides killed Sudhir, they said.