Dashrath Gurjar (24), Khushiram Gurjar (35), Rohtash Gurjar (24) and Bunty alias Surajbhan (50) have been arrested, Circle Officer, Alwar South, Anil Beniwal said.
The body of 35-year-old Umar Khan was found near a railway track on November 12 last year in the district's Rampur area.
With this, eight people have been arrested in the case, the police said.
Two country-made pistols were also seized from Bunty and Khushiram, Beniwal said.
Station House Officer, Govindgarh, Dara Singh said that they have been booked under relevant sections of the Indian Penal Code, including rioting, murder and attempt to murder.
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