Senior Superintendent of Police Manu Maharaj said the absconding criminal Karmu Rai was arrested from Bhagwanpur village under Fatuha police station of the district.
He said the arrest came on a tip off that the criminal was living there by hiding his identity.
Karmu Rai was the criminal who fired on the jeweller resulting in his death on January 16 in Patna.
Five of his gang men were already in the police net in connection with the daylight killing of the jeweller in Rajapur bridge area under Sri Krishna Puri police station, the SSP said adding, the police have recovered the revolver used in the crime.
The Police were on the lookout for Durgesh Sharma, the SSP said.
Murder of the jeweller in the heart of the capital on Saturday night had triggered a sharp criticism of the Nitish Kumar government on law and order situation.