Police said three-four men approached the duo and attacked them after an argument broke out. (Special Arrangement)A 30-year-old man was stabbed to death inside a Delhi Development Authority (DDA) park in Northwest Delhi’s Bharat Nagar on Tuesday afternoon after he allegedly confronted a group of four youths for passing lewd remarks at his woman friend, who was also critically injured in the attack. Police identified the deceased as Sunil, a resident of Mainpuri in Uttar Pradesh. He was visiting the city when the incident took place. His friend, Devki (26), a resident of Jahangirpuri, has been admitted to the hospital.