In a shocking incident, a 40-year-old man was stabbed to death on Monday allegedly after he informed the owner of a house about some people drinking on his building rooftop in Delhi's Patel Nagar area. The deceased man is a resident of Prem Nagar in Patel Nagar. On the intervening night of Thursday and Friday, some people were drinking alcohol on the rooftop of a house at Prem Nagar in Patel Nagar, police said. Shah informed the house owner about it. On Monday, the six accused, aged between 16 and 20, came to intimidate the man and his family with sticks, rod and knife. Two of the accused stabbed the man and his son.