Etawah: A 20-year-old youth was allegedly murdered by a relative of the girl he was having an affair with, following which his father killed the accused for revenge in Jagsaura village, police said. Sanju had eloped with a girl of the same village about a week back and returned two days ago, Superintendent of Police Piyush Srivastava said. On Wednesday night, Sanju was attacked by the girl's uncle, Pratap (28), who hacked him to death with an axe in Jaswant Nagar area, Srivastava said. When the victim's father, Lekhraj, received the news of the murder, he killed Pratap with an axe, the SP added. Police have sent the bodies for post-mortem and a hunt has been launched to nab Lekhraj.