A child could hold the key to convicting the person or people responsible for the death of former champion cyclist Gary Wiggins, Mr Wiggins' sister believes.
The child, who is now in their teens, was in the Aberdeen house that Mr Wiggins, 55, was visiting on January 24, 2008, before he was found unconscious in nearby Segenhoe Street the next morning.
He died in hospital.
Glenda Hughes, Mr Wiggins' sister, said she is more determined than ever to bring those responsible for her brother's death to justice and she believes the child who was in the house has the answers.
"That child is now a teenager and may be ready to talk," Mrs Hughes said.
"Maybe they will brag to someone about what they saw and I hope someone is there to hear it and report it."
A coroner found that Mr Wiggins was assaulted before his death, but ruled there was insufficient evidence to lay charges.
The coroner also found that some witnesses lied at the 2009 inquest.
Mr Wiggins was unconscious when he was dragged from the house and dumped on a footpath before he got up and staggered away, the coroner found.
Mr Wiggins died from haemorrhaging due to a blow to the back of his head.
Mrs Hughes implored anyone with information to call Crime Stoppers on 1800 333 000.
She said the Christmas period through to the anniversary of her brother's death on January 25 was always a difficult time for her.
"I can't move on . . . it's soul destroying," she said.
"I go about my work and my daily life, but I cannot let go of what happened to my little brother and the fact that those responsible are walking the streets."
Mr Wiggins was a professional cyclist who raced in Europe in the 1970s and 1980s.
His son is British Olympian and Tour de France cyclist Bradley Wiggins.