New Delhi, Aug. 31 -- A 19-year-old man was stabbed to death and his cousin injured after four men allegedly attacked them with knives over an old dispute in south Delhi's Khirki Extension early Saturday, police said. The deceased was identified as Vivek Gupta, who worked as a helper at a restaurant in Select City Walk Mall. His cousin, Aman Gupta, 21, employed at another restaurant in the same mall, is undergoing treatment at AIIMS Trauma Centre. The incident occurred when the two were returning home late at night. Around 2am, a PCR call alerted police after locals saw the cousins lying in a pool of blood on the street. At 2.25am, another call was received from Madan Mohan Malviya Hospital, stating that Vivek had succumbed to his injuries....