Surendra was arrested after being injured in an encounter with police in the district, Superintendent of Police (SP) P.K. Tiwari said.
He has been admitted to a nearby hospital, the official said.
Surendra alias Tar Babu has been accused of killing an Amit Yadav in Sikandrabad district on October 3 last year.
He had come to Sikandrabad from Tundla to kill plaintiff Rajnish in Amit Yadav's murder case.
One bike, a country-made gun, and live cartridges were recovered from his possession, the official said.
The police have been searching for his accomplice in the nearby forest area.(ANI)