High school maths teacher Amanda Carter was passionate about soccer but homicide detectives are now investigating if her weekend referee duties are linked to her murder.
The 46-year-old mother of three was found dead by her youngest daughter in a bedroom of her Ivory Crescent home at Woongarrah on the NSW central coast at about 10am (AEST) on Sunday.
She was home alone at the time of her murder and police have said nothing about what injuries the Wyong High School teacher suffered.
A neighbour reported hearing a loud thud come from Ms Carter's home on Saturday night.
"The situation at the crime scene led investigators to immediately suspect that this death wasn't normal and wasn't anything other than suspicious," Detective Inspector Julie Hurst told reporters on Monday.
Police are interviewing family, friends and work colleagues as part of their investigation.
They are particularly keen to hear from people who saw Ms Carter on Saturday when she refereed soccer matches at a park south of her home suburb.
"Detectives are also keen to speak to anyone who was at Pluim Park, Lisarow, on Saturday and may have seen Amanda, who was refereeing from 12.30pm," Insp Hurst said in a statement.
"We are also appealing for anyone who may have taken vision of any of the game after 12.30pm.
"We are also keen to hear of anyone who saw anything unusual, or had interactions with her."
That day, Ms Carter first refereed an under-16 boys representative match and then was assistant referee for an under-18s match, a spokesman for her soccer club, the Kanwal Warnervale Rovers Football Club, said.
Insp Hurst said Ms Carter's movements and interactions on Saturday would form part of the murder investigation.
"Any situation that ends like this we need to piece together not just what's happened in the last few days but in the weeks and months leading up to the death and, obviously, to try and find out what's happened and who's responsible," she said, adding that it is possible Ms Carter knew her killer.
The club spokesman, who was not at Pluim Park on Saturday, said he had not been alerted to any trouble involving Ms Carter's refereeing duties.
On Monday, the club posted a notice on it's website about Ms Carter's death, extending condolences to her family and friends.
Club president Ross Ankrett said Ms Carter had been a member for more than 20 years.
"She played and refereed, and years ago she used to coach," Mr Ankrett told AAP.
"This news is shocking for everyone. The first reaction we all had was one of just sheer disbelief."
Students at Wyong High on Monday were mourning Ms Carter.
"Counselling and support have been made available to students and staff, some of whom have taken it up," a Department of Education and Training spokesman said in a statement on Monday.
It is understood that until recently Ms Carter had been living with her partner but that the relationship had ended in recent months.