Police investigating the death of a man in a hit-and-run incident say they hope an appeal through social networking sites will help them solve the case.
Wilf Sarjeant, 85, died after being hit by a VW Passat on Elm Lane, Sheffield, in February 2008. The car's driver has never been traced.
South Yorkshire Police said they hoped their renewed appeal would be shared on sites such as Facebook and Twitter.
The appeal includes details of a Chinese man they want to speak to.
Mr Sarjeant, a World War II veteran who would have been 88 last week, died in the incident on 1 February, 2008.
The silver VW Passat was later found abandoned on the city's Grange Mill Lane.
South Yorkshire Police want to speak to a Chinese man in his 30s known as Ming Guo Chen, who they believe may have information about the incident.
The force said Mr Chen has a long history of employment in the Chinese food industry, and may use other names.
The search for Mr Chen has taken detectives across the UK, and an appeal to trace him has already been made on the BBC's Crimewatch programme
Senior investigating officer Sgt Steve Askham said: "We hope the power of social media will help us reach a much bigger audience and someone will come forward with vital information.
"I urge anybody reading this to share it with their online networks and help us find Mr Chen.
"Our thoughts continue to be with Mr Sarjeant's family who have conducted themselves with great dignity during this sad and difficult time."
A married father of two children, Mr Sarjeant was well known to many people through his work at the Sheffield Deaf Club and as a founder member of Ellesmere Operatic Society.
Anyone with information is asked to contact South Yorkshire Police, or telephone Crimestoppers.