On Friday, Sunny visited the victim's residence when she was alone. When the woman refused to carry on with the relationship, Sunny stabbed her multiple times.
A pack of 8 to 10 stray dogs attacked and pounced on the woman and left her bleeding in different parts of her body.
The woman was part of a 13-member group who were staying at the hotel after finishing a wedding ceremony.
A police official said militants abducted Ishrat Muneer Bhat from Dangerpora area of Pulwama and later shot her dead in village Dragad in Zainapora area of Shopian district.
Police have detained the accused Narsingh Rawat for allegedly killing his wife of 12 years.
The woman was taken to the Sayla CHC, where she died Tuesday night while undergoing treatment, the official said.
According to Shahjahanpur GRP station in-charge AK Pandey, the woman had sustained grievous injuries in the brawl.