The teenager hopes fresh information could provide a breakthrough
More than 100,000 people have visited a website launched by a teenager to find the person who murdered his mother 11 years ago.
Daniel Grainger was five-years-old when his mother Patricia was strangled and stabbed to death near their home in Parson Cross, Sheffield, in 1997.
On the anniversary of her death, the 16-year-old launched whokilledmymum.com for people to provide new information.
Due to an overwhelming number of people accessing the site, it has now crashed.
But visitors can still access the message board where hundreds of messages have been left.
One woman wrote: "Good luck Danny, you are doing a wonderful thing for your mum, hope justice is served."
Ms Grainger's body was found by youths dumped in a brook near her home. She had been stabbed, strangled and sexually assaulted and covered with a mattress.
Despite an extensive investigation by South Yorkshire Police the mother-of-one's killer was never found, but Daniel hopes the website will urge detectives to reopen the case.
He said: "If someone knows what happened, if they do have a heart then they will read the messages on the website and it may persuade them to come forward finally."
The 16-year-old also hopes that new advances in DNA technology could help catch the killer.
South Yorkshire Police said the case is still active and anyone with information on the incident should contact its officers.