New Delhi, Dec. 1 -- A 52-year-old man was shot dead by a group of unknown assailants in south Delhi's Aya Nagar early on Sunday. Police said the victim, Ratan Ram, had stepped out in the morning to buy milk when the incident happened. No arrests have been made yet. Ram's family alleged that it was a revenge killing as his son, Deepak, had killed a businessman named Arun Lohia in May this year. Arun was in his SUV with his father and they were returning from a court when Deepak and another assailant fired 10 rounds at them near Chhatarpur metro station, killing Lohia. Deepak and his associates, Yogesh and Ajay, were arrested within two weeks of the crime. Police said the enmity is over a land dispute. "Deepak and Arun were friends earlier. ...