The accused has been identified as Sushanta Sarma of Baligaon.
Police arrested 15 accused so far involved in the mob lynching case.
A mob of 50 people attacked the AASU leader Animesh Bhuyan on November 30.
Meanwhile, the prime accused in the lynching of Animesh Bhuyan died in the wee hours on December 1, allegedly in a road accident while trying to flee police custody.
