The accused Pawan Kumar was apprehended from a train in Varanasi by the police, who upon interrogation revealed that the minor boy identified as Dipanshu was buried in a field in Bhelai village of the district.
Kumar had kidnapped the minor boy from his house on May 26 and demanded a ransom of Rs 10 lakh from his kin, the Superintendent of Police (SP) Satyavir Singh said.
The SP said the accused had left a letter for the minor boy's kin asking them to leave the amount in a bag in a Varanasi-bound train.
Kumar told the police that he had strangulated his nephew and dumped his body in a field, he said.