Police did not oppose the granting of interim name suppression.
The man was arrested on Sunday morning after Mr Keogh's death shortly after arriving at Kaitaia Hospital on Saturday about 10.30pm.
Police are releasing few details, but it is believed that Mr Keogh and another person were involved in a fight on the side of Fairburn Rd.
Two of Mr Keogh's children and two young sibling were believed to have seen the incident and drove the him to the nearest house.
An ambulance was called and Mr Keogh was driven about 12km to Kaitaia Hospital.
The officer in charge of the inquiry, Detective Senior Sergeant Rhys Johnston, said Mr Keogh's injuries were believed to be the result of the altercation, but he declined to offer any detail of those injuries or whether a weapon had been involved.
Those questions would be answered by the post mortem, he said, adding that the arrested man and Mr Keogh had lived in the same locality.
The two men were known to each other.
A team of 17 had been assembled for the inquiry. They included a number of child specialists, who were helping provide support to the four children, aged from 3 to 13 years.
Mr Johnston said on Sunday the priority was looking after the children and giving them full support.
"They have suffered a great trauma," he said, adding yesterday that they had done an "amazing" job of getting Mr Keogh away from the scene.
Child, Youth and Family had assisted by providing specialist interviewers and on-going trauma counselling.
Police were still at the scene yesterday, while a car parked outside Kaitaia Hospital underwent forensic examination on Sunday.
It had since been returned to the family, Mr Johnston said yesterday.
Witnesses were also still being interviewed.
"We're still in the very early stages," he added.
