Clan leaders are being called to assist Papua New Guinea police in solving the murder of Australian Robert Purdy.
62 year old Mr Purdy died instantly in the early hours of Monday morning after being shot with what police believe is a nine-millimetre pistol when a group of up to 10 men stormed a home in Mt Hagen, in PNG's Western Highlands Province.
The men then gang raped a woman who was also staying at the house.
Police have yet to identify suspects.
Police Commissioner Tom Kulunga told reporters in Port Moresby he wants to reassure the relatives of the victims that everyone involved in this barbaric incident will be brought to justice.
He also appealed to clan leaders living around Kagamuga in Mt Hagen to come forward with information.
The PNG Prime Minister Peter O'Neill has called Mr Purdy's murder the cowardly act of animals.