A dispute yesterday broke out between Chottelal Tiwari and Satish Mishra which soon led to confrontation between the two in which the latter opened fire in Osa village, they said.
Chottelal's son Kripanand (24) was killed in the firing, while Chottelal, his second son Siddharth and nephew Sarvesh were injured in the incident and have been admitted to the district hospital, they said.
An FIR has been lodged against four persons, including Satish and others, who are absconding, police said.