Manish Sharma, 23 who along with his friend had opened fire on several people, killing three and injuring another four, succumbed to his injuries on Monday.
Sharma had also shot himself and was being treated in Baba Ambedkar Hospital.
Two women, who were killed, were the alleged love interest of the jilted assailants.
The shooting spree that lasted for 30 minutes took place within 500 metre area of North Delhi's Swaroop Nagar on Thursday.
The incident happened when Rajbeer Sharma and Manish Sharma went to Sharma's elder brother's house, with whom he had a property dispute, in the same locality.