It is two years today since champion cyclist Gary Wiggins, 55, died after being found unconscious in Segenhoe Street, Aberdeen.

He died from hemorrhaging caused by a blow to the back of his head.

A coroner stopped short of recommending charges against two men last February, but found that Mr Wiggins was probably assaulted on the evening of January 24, 2008.

Mr Wiggins, who raced in Europe in the 1970s and 1980s, was found on the morning of January 25 and died later that day.

Mrs Hughes pleaded for those with information to call Crime Stoppers on 1800 333 000.

"I know in my heart and my soul that it's not right and I want the residents of Muswellbrook and Aberdeen to know that I'm not going to give up until justice is served," Mrs Hughes said.

She conducted her own inquiries in Muswellbrook and Aberdeen in the days after Mr Wiggins's death and discovered a web of secrecy and innuendo.

"There are people who know what happened to Gary," Mrs Hughes, of Melbourne, said.

"I heard all sorts of things when I was there.

"I still have a lot of trouble knowing that the people who are responsible for this are still walking around free."

Coroner Elaine Truscott labelled as liars two people whose versions of events were in stark contrast to other witnesses.

Ms Truscott ruled when delivering her findings in February last year that Mr Wiggins appeared sober when he attended a McQueen Street, Aberdeen, home at about 8.30pm on January 24.

Mr Wiggins was unconscious when he was dragged from the house about 15 minutes later and dumped on a footpath, Ms Truscott said.

A passing car beeped its horn and Mr Wiggins got up and walked away.

Mr Wiggins's son Bradley finished fourth in the Tour de France last year and has won Olympic gold for Great Britain in track cycling.