Acting on a tip-off about the presence of a group of five ULFA cadres in Hebeda village, police launched an operation in the area.
In an ensuing encounter the militant was killed while others managed to escape.
The slain militant was identified as Debojit Duara alias Wangli Asom. His elder brother, also a suspected ULFA militant, was killed in an encounter in 2007.
Police recovered a grenade and some ammunition from the slain militant.
A massive combing operation was launched in the area to arrest other militants who managed to escape.