Ganesh Kumar Kannaujia was arrested by STF from Dhobi mohalla of Jaunpur district, a police spokesman said.
Kannaujia was arrested following a request made by Mumbai police to help solve a murder case in which he was the main accused, the spokesman added.
S Parashuraman (85) was murdered in Chembur area of Mumbai and his house looted on September 18, he said.
The spokesman said that Kannaujia has accpeted his role in the crime, committed with the help of three others.
Kannaujia and his accomplices killed the house owner and had left behind his wife taking her as dead before fleeing with cash and ornaments worth lakhs, he said.