The deceased Nath Ram was in love with a girl whose family disapproved of the relationship, they said.
Ram was shot dead yesterday by her kins in Saidpur village under Charthawal police station, they added.
Police has registered a case against Sachin and Monu, brothers of the girl, in connection with the killing after Ram's uncle Ramesh filed a complaint.
The body has been sent for postmortem, they added.