Santosh Pandey was brutally beaten up at Narah village under Nawadih police station and he died hours after being admitted to a hospital, the sources said.
Police said they were investigating the veracity of the report that Pandey was allegedly in love with a girl from a different caste and was beaten up at a "jan adalat".
Pandey's family alleged that a local MLA, his brother and some other people were behind the incident.