Renowned journalist Derek Round died in a "horrific attack" in the living room of his Wanganui home, a forensic examination has revealed.
Round, 77, a former foreign correspondent, was found dead this week.
It was reported that Round once worked as a spy and had links to the KGB.
A cousin, Martin Round, told 3 News that the murdered man told him he planned to write memoirs that would reveal his work as a spy.
The news clip alleged that when former Prime Minister Keith Holyoake made a comment that could have identified Round as a spy in 1962, two Soviets were expelled from New Zealand.