Heavy security arrangements were put in place in the village in Deoria district for the visit which was kept under wraps till the last hour.
"The entire Congress is with them in this hour of great tragedy and loss and they will get full justice," the Congress leader told reporters at the burial ground where he paid tribute to the slain police officer after meeting his family at their home in Jaffuar tola here.
The Congress leader drove here from Gorakhpur to meet the family and offer his condolences.
Zia's family members refused to divulge details of the meeting with the Congress leader.
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The sister-in-law of the slain officer said his widow Parveen Azad was unwell and not in a position to speak.
Raghuraj Pratap Singh alias Raja Bhaiya, a controversial UP politician was on Thursday booked by CBI under murder charges in the killing of Zia in Kunda in Pratapgarh last Saturday after the probe into the case was handed over to the central investigating agency.