The accused, identified as Dushyant Kake, who is a trained wrestler, was allegedly involved in the murder of a man from a rival gang at northwest Delhi's Pitampura area in July last year.
While two of his associates - identified as Badal and Deepak - were arrested, Dushyant was still at large, said Joint Commissioner of Police (Crime) Ravindra Yadav today.
The police received a tip-off about Dushyant's present hideout and rushed a team to Barabanki from where he was arrested, he said.