AN accused double-killer is believed to have gone on a violent and bloody rampage in the hours before he allegedly murdered a couple in their NSW's Central Coast home on Friday night.

A 25-year-old man has been charged with the murders of a 55-year-old man and a 45-year-old woman about 8.30pm.

No names have been released, but it's believed the alleged killer knew both victims.

Their bodies were found by emergency services and the accused was arrested at a nearby industrial estate where police seized a knife. He was remanded in custody after he appeared in the Gosford Local Court yesterday.

Police are now tasked with piecing together why the alleged murders happened. They are also questioning the man over a rampage which took place across a number of suburbs earlier in the evening, including a carjacking, crashes and an assault.

He is yet to be charged over the incidents as investigations are continuing. Police are investigating connection to an alleged domestic incident.

He is then alleged to have attempted to stab a man during a car-jacking. The injured man drove to a Central Coast service station to raise the alarm.

The car was dusted for fingerprints and a crime scene established around the petrol station.

A short distance down the road, he allegedly assaulted two other men in a takeaway shop before trying to unsuccessfully gain entry to a home but stole a Subaru instead.

He is then alleged to have trespassed before stealing a second vehicle and then attempting a home invasion.

A short time later the bodies of the couple were found inside a house.

Police and paramedics attended, sealed off the area and began gathering evidence. Police said the accused was spotted driving a vehicle and a pursuit began.

He was finally arrested at the industrial estate.

A resident, who asked not to be named, told The Sunday Telegraph: "I received a call from my daughter about 8.30pm last night and she said 'mum, please lock your doors, someone has gone berserk'.

"I had a feeling something was going on," the woman said.

Investigations are continuing into the cause of the deaths. A brief will be prepared for the coroner.

The man will appear in Wyong court on Tuesday.