Anyone with information about the fatal stabbing should call South Yorkshire Police on 101 and quote incident 856 of March 6.
Crimestoppers can also be contacted, anonymously, on 0800 555111.
5. Fatal stabbing
A police cordon remained in place around the murder scene for most of the weekend and there remains a heavy police presence in Woodthorpe in the wake of the knife attack. Photo: Dean Atkins
6. Fatal stabbing
Detective Inspector Scott Harrison, leading the murder probe, said the force is 'working hard to piece together exactly what happened' on the night of the stabbing but no arrests have yet been made. Photo: Dean Atkins
7. Fatal stabbing
A full forensic examination of the house where Jordan was stabbed was carried out in the wake of the attack. Photo: Dean Atkins
8. Fatal stabbing
Detectives investigating the murder want to hear from residents in and around Woodthorpe with CCTV cameras installed at their homes. They also want to hear from motorists with dashcams who were in the area on the night of the murder. Photo: DEAN ATKINS