Police investigating the death of a Durham Univeristy Student say they anticipate enquiries to last 'a number of months'.
Detective Superintendent Kevin Weir, who is leading the investigation, said:
Police say they have interviewed around 50 people who were out in the Walkergate area on the night that Olivia died, including bar staff, door staff and people queuing to get into Missoula nightclub.
Officers have also scoured CCTV footage of the moments leading up to the incident.
In a moving tribute Olivia's family referred to her as 'the light of our lives' before announcing that the 20-year-old will be laid to rest on Monday 12 March.
The funeral will take place in her home town Milford-on-sea in Hampshire.
The family ended the tribute with a quote from Shakespeare play a Midsummer Night's Dream.