The horrifying incident occurred in the early hours of Sunday at KD Colony in RK Puram. The attackers arrived armed with firearms, specifically targeting the brother of the two sisters.
Sahil's family never accepted his marriage with Nikki and chose another woman to be his life partner. Under pressure, he killed Nikki.
Sahil was reported to the police by his father.
On its part, BJP says it is checking whether Mittal is a party member.