Police found the 68-year-old man's body in a home in a nearby suburb on Friday.
A father who shot and killed his two teenage children in Sydney's north-west has been found dead.
The children's 36-year-old mother, who lives at the West Pennant Hills home with the children, was treated for significant shock.
New South Wales Police Acting Assistant Commissioner Brett McFadden told reporters the father appeared to have planned the killings, using legally-owned firearms.
Acting Assistant Commissioner McFadden told news.com.au it had not yet been determined how many shots were fired but that police were speaking with several witnesses.
Mr Edwards, who was described as a "recluse" by a neighbour, was a financial planner and volunteered with the NSW Rural Fire Service, Lions Club and Pennant Hills Junior AFL Club, according to his LinkedIn page.
Police also located two handguns registered in the father's name at the property in Normanhurst.
"But we believe this incident to be a targeted incident, so there are no risks to the community at this time", he said.More news: Montreal's England fans, bar owners rejoice in victory over Sweden
More news: Suzuki reveals European specs of new Jimny
More news: Tyler Honeycutt dies following gunfire exchange with police
It's believed the person being sought was the father of the children, aged in his 50s. Police say the parents' long-term relationship had broken down and a custody battle had been ongoing for about two years.
NSW Ambulance Inspector Kevin McSweeney said when paramedics arrived at the scene they were confronted with "an extremely distressing and stressful situation".
"Unfortunately there was nothing we could do to help [the two teenagers]", he said.
"It is what can only be described as a tragic set of circumstances for the whole family", he added.
Forensic police officers are now at the house.
He told reporters the attack was a "very harrowing experience for those initial responding emergency service providers". It's understood the two teens' bodies were removed just before 6am the following day. "A lot of young people have been moving into the area".
"Our hearts go out to the mother and to all of the family", he said. In the USA, the suicide prevention lifeline is 1-800-273-8255 and the domestic violence hotline is 1-800-799-SAFE (7233).