Lindsay Ann Hawker, 22, from Brandon near Coventry, was found dead in a bath filled with sand on a balcony in Ichikawa, east of Tokyo, on March 27 last year.

Detectives are still hunting 29-year-old suspect Tatsuya Ichihashi, who lived at the flat where Miss Hawker's body was discovered and fled when approached by officers for questioning.

Miss Hawker's parents, Bill and Julia, and her two sisters, Lisa and Louise, will leave London's Heathrow Airport on Sunday to travel to the Japanese capital to renew their appeal to find her killer.

The family will hold a press conference in Tokyo on Monday and help Japanese police raise awareness with a new poster appeal on Tuesday, exactly a year since she was last seen alive.

The new poster shows computer generated photo-fit pictures of what Ichihashi could look like one year on.

Amanda Stocks, the family's spokeswoman, said: "They are going out to Japan to raise the profile of the case because suspect Ichihashi is still at large.

"The family want to remind people a year on that he has not been caught and want people to remember Lindsay."

A post-mortem showed Miss Hawker had been suffocated, and had suffered severe injuries to her arms.

A webpage set up on social networking site Facebook, called "Don't forget Lindsay Hawker, Please remember this Face", now has more than 20,000 members.