Slain North Otago dairy farm worker and father-of-two Justin McFarlane was killed in his own home and police believe multiple people were involved in the attack.
Police said last night they were looking at several possible motives.
A Palmerston teenager was yesterday charged with murdering McFarlane, who was found dead on Wednesday.
Steven Kenneth Boskell, 18, was remanded in custody to reappear in the Timaru High Court on October 1 after his appearance in Dunedin District Court. No plea was entered.
He was charged with murdering McFarlane, jointly with a person or persons unknown.
The arrest followed the discovery of McFarlane's body at his home in Elderslie, near Oamaru, early on Wednesday. His burnt-out car was later found 25 kilometres away.
Police are urging others involved to come forward.
Acting Detective Inspector Colin Blackie said McFarlane was killed inside his home. No weapon had been recovered.
The results of an autopsy, carried out in Christchurch, were not yet available but the investigation was progressing quickly, Blackie said.
Police had raided several homes across Waitaki and believed multiple people were involved in the attack.
McFarlane's killing is the talk of the town in Oamaru.
His family did not want to comment, but locals said McFarlane had been involved in drugs.
Blackie said: "There's a number of options available as to why this has occurred. Whether this is a result of some previous bad relationship or criminal offending, it's too early for us to establish or speculate."
He appealed for those on the run from police to hand themselves in.
"We really would like these people, who are probably sitting somewhere reflecting on what they have done, to come forward on their own terms. They'll be uncomfortable and fighting their conscience."
Blackie also appealed for sightings of a grey Nissan Skyline car involved in a short police chase on Wednesday morning on State Highway 1 just south of Oamaru.
The vehicle was travelling on roads around Elderslie and Maheno, inland from Oamaru, before joining the state highway.
It was found abandoned in the Oamaru area and police believed it could be linked to McFarlane's death.
Blackie would not be drawn on how McFarlane died as he did not want to prejudice the case, but confirmed it was a violent death.
The body was found by a colleague who went looking for him after he failed to turn up to work at a dairy farm.
It is understood he had two young children.
Elderslie Dairy Farms director Stanley Ruddenklau said McFarlane's colleagues were shocked and saddened to learn of his death.
"He was a very hard-working young man. We are pretty cut up about it all."
McFarlane, who had split with the mother of his children, had worked for the company about five years.
He had lived in the three-bedroom farmhouse, where he was killed, for about two years, Ruddenklau said.
The 440-hectare farm milks about 1050 cows and employs six staff.
Sheep and beef farmer Sheree Kennedy said she discovered the burnt wreckage of McFarlane's burgundy-coloured car in Serpentine Rd, Maheno, about 25 kilometres from McFarlane's home. She called police.
"It was just an empty shell. It must have been fairly hot at some point."
About 40 police staff and experts are working on the case, assisted by Environmental Science and Research and the Fire Service. Anyone with information on McFarlane's movements during the days before his death is asked to ring the Oamaru police station on (03) 433 1400.
Information can also be provided anonymously by calling Crimestoppers on 0800 555 111.
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