"Killers are killers. Whoever they may be. When they did not show mercy while killing my husband, why should I be compassionate to them. They should be subjected to the harshest punishment", Mahvish told reporters.
Mahvish has alleged that her family members were behind the death of her husband.
According to Mahvish, the victim was shot dead by her family members on November 22 after he had just entered a Bulandshahr village in Uttar Pradesh along with her and their two-year-old daughter.
Hakim (29) and Mahvish had participated in the honour killing episode of Khan's show 'Satyamev Jayate' to speak against the problem.
Mahvish eloped with Hakim in October 2010 after which the couple got married and were staying in Delhi following opposition from the man's family, according to police.
"I have not committed any sin by loving him. I will not sit idle till justice is done," she said.