Detective Senior Sergeant Peter Trichias from the Homicide Cold Case Team investigates this case. "She (Margaret) was a single woman. She was quite independent, very strong. Her family to this day have screamed out for answers."
35-year-old Margaret was amicably divorced and a devoted mother. Those close to Margaret described her as friendly. "She was vivacious and fun-loving. She was always there for her children," says Margaret's sister Joan Nelson.
At approximately 6pm on the night of their murders long- time friend Jim Rollins arrived at Margaret's house to pick her up for an evening at the Opera. The plan was to drop nine-year-old Seana at a babysitter on the way into town.
When Jim arrived at the Ferntree Gully house everything was in darkness. "I immediately thought that something was very wrong." Entering the house through an unlocked door, Jim made the gruesome discovery.
Detective Senior Sergeant Ken Mahon was the first CIB detective to arrive at the house. "It was just a horrible scene. That poor little girl, she's had her life just cut short. I was absolutely gutted. It really upset me."
The relatively tranquil scene for a brutal double murder gave homicide detectives their first major clue.
"It doesn't appear to be a random attack. It is likely to have been committed by somebody that Margaret and Seana knew," says Det. Snr. Sgt. Trichias.
What they saw that night even disturbed some of the most experienced investigators and the more they investigated the more the mystery deepened.
Detective Inspector Mick Hughes appeals, "We have a double murder of two innocent people here and we have the opportunity to solve it so my plea would be to people that if they have any information that would assist our investigation to come forward."
To this day Margaret's family search for answers, "If there is anyone out there who knows something I would hope they would have the courage to come forward," pleads Joan.
Anyone with any information can call Crime Stoppers on 1800 333 000 or make contact through their website.
For more information about the reward visit the Victoria Police news website: www.vicpolicenews.com.au