A Queensland police officer will face court on Monday charged with the murder of his baby son in 2014.
The senior constable's two-month-old boy died after suffering "significant" injuries at his home at bayside Victoria Point, south-east of Brisbane, on June 28, 2014, Deputy Commissioner Steve Gollschewski said on Saturday.
The 38-year-old was stood down on full pay one month after the child's death, when an investigation was launched.
He was not on duty at the time the boy died.
The Brisbane region senior constable was arrested and charged on Saturday after a protracted probe involving multiple investigatory agencies, including the police Ethical Standards Command and the independent Crime and Corruption Commission.
As the matter is before the courts, Mr Gollschewski declined to elaborate on how the baby boy is alleged to have died but said the injuries that caused his death were severe.
"It's a complicated one, other than to say there were fairly significant injuries to the baby," he said.
"This is a very tragic event with the loss of a young, innocent life and the devastation of a family.
"These types of investigations are very difficult and challenging and in this instance quite protracted."
Mr Gollschewski defended Queensland Police Service not revealing one of their officers had been stood down subject to a murder investigation until he had been charged.
"As with any of these types of investigations, they are very difficult, it's very important they are conducted in a way that the evidence is preserved and that we are able to present that to a court so a proper determination can be made," he said.
"Our community needs to have confidence, great confidence, that no matter who is responsible for these types of crime, the police service will be relentless and committed to ensuring investigations are brought to their conclusion and the offenders are brought to justice."
State Crime Command Detective Superintendent Cheryl Scanlon said all infant murder investigations were lengthy and detailed ones.
"In terms of any infant homicide they are not necessarily made known to members of the media, it doesn't matter if there is a police officer charged or a member of the community, they are extremely difficult, complex and protracted investigations," she said.
"Where you have experts involved and they take many, many months to resolve, this particular case is no different to other cases involving infant homicides."
Mr Gollschewski said the alleged crime was a particularly tragic one."I'm a father, these sort of crimes, irrespective of who commits them, are tragic and terrible," he said.
"I can only say that we are committed, as we have been in this instance, to making sure the offender was brought to justice."
The baby's father has been remanded in custody to appear in Brisbane Magistrates Court on Monday, February 1.