The sister of a popular dance teacher murdered in his bed in Sydney 13 years ago has tearfully appealed for any information that may lead to finding the killer who "destroyed our family".
A $100,000 reward is being offered for information about the murder of Anthony Attard, 38, who taught "rock n roll" throughout the Sydney metropolitan area.
He was found dead with head injuries in his home at Girraween, in Sydney's west, by his girlfriend on June 18, 1999.
Police believe he was attacked in his sleep.
On Wednesday Mr Attard's younger sister Donna Sim fronted the media to urge anyone who may have information on who killed the "fun guy" who was her brother to contact police.
"The person who did this has totally destroyed our family, he needs to pay for what he has done," she told reporters.
Ms Sim said the family's wounds were as fresh now as they were 13 years ago.
"My mum hardly ever gets out of the house ... I believe it killed my dad. We lost our dad a few months ago."
Ms Sim's daughter, 13-year-old Ashley, said the uncle she never knew loved his dancing just as she loved her dancing and he had been the heart of the family.
Ms Sim said her brother was a funny guy who loved people and "put 48 hours into 24 hours".
"He was my big brother, he looked after me always... he was my life," she said, before breaking down in tears at the end of the press conference.
"I just want justice done for him."
Mr Attard was last seen alive at his home by a work colleague about 10.30pm on June 17 - the day before he was found dead.
The pair had shared a coffee after a dance class at the Hornsby RSL.
A post mortem suggested a heavy weapon was used in his death but it has never been found.
Detectives hope the reward will encourage someone to come forward.
"From all accounts, Tony was a popular man who had no known enemies," said Detective Chief Inspector John Lehmann from the Unsolved Homicide Team.
"Whilst we don't know why he was targeted, we do believe his killer could have lived within the local community and might still reside there.
"We are sure that someone in that community has information about that person's identity."