The ultra was killed in a gunfight at Kujjan village in Kulgam district, 75 km from here.
The slain militant was initially identified as Showkat Ahmad Tak, a resident of Panzgam in Tral area of Pulwama district, they said.
When Tak's family members were called to a police station for taking the body, they informed cops that the deceased was not their kin.
During further investigations, it turned out that the slain militant was Shabir Ahmad Mir, a resident of Yaripora in Kulgam district, they said.
Mir was a top Lashkar commander and an 'A' category ultra who was carrying a cash reward on his head.