The girl complained that the accused were harassing her and when her brother Lakshman objected to it, the four persons stabbed her and fled from the spot, police said.
He was taken to a hospital where he succumbed to injuries.
On the basis of the complaint, an FIR was registered against the accused Deepak, Kapil, Suraj and Dharmpal on the charges of murder and eve-teasing, they said.
The victim's family members today blocked a road at Janta Colony demanding the arrest of the accused.
Later, one of the accused, Kapil was arrested and a hunt was on for the others.