Update 18 March 2021: Detective Superintendent Wayne Fox, Head of the North Yorkshire Major Investigation Team, has released a video and statement to mark the 12th anniversary of the Claudia Lawrence case.
North Yorkshire Police's commitment and determination to solve the case and bring closure for Claudia's loved-ones, is undiminished by the passage of time.
If you have any information that could assist the investigation, please contact North Yorkshire Police on 101, select option 1, and pass details to the Force Control Room, quoting "Claudia Lawrence".
Claudia was reported missing by her father Peter Lawrence on Friday 20 March 2009, after friends became concerned that they had not heard from her since Wednesday 18 March.
This timeline shows events and key lines of enquiry from the days surrounding Claudia Lawrence's disappearance.
In Claudia's house, the bed had been made and there are what appear to be breakfast dishes in the kitchen sink.
In the effort to locate Claudia's missing rucksack, the investigation team want to hear about a similar rucksack that was spotted near the University of York at about 1pm on Thursday 19 March 2009.
Another significant line of enquiry from 2009 was the sighting of a man and woman seemingly involved in an argument on University Road, outside the University of York, at about 6.10am on Thursday 19 March - around the time Claudia was due start her shift as a chef at the university.
Claudia’s missing silver Samsung D900 mobile phone – new analysis shows it was active in the Acomb area in the weeks before she disappeared
The investigation team still believe Claudia's silver Samsung D900 mobile phone was deliberately turned off by someone at about 12.10pm on Thursday 19 March 2009.
Back in 2009, one of the key police appeals was to identify a man - often referred to as the "left-handed smoker" - who was seen with a woman on Melrosegate Bridge at around 5.35am on Thursday 19 March.
At mid-morning on 1 April 2009, a man entered the Co-Op store at Tang Hall in York. He commented to members of staff that he either knew Claudia or used to work with her.
A passer-by who was cycling to work recalls seeing a man standing outside Claudia's house between 6.45am and 6.55am on Thursday 19 March 2009.
A DNA profile of a male has been established from a cigarette butt found in Claudia's 'green-blue' Vauxhall Corsa, which was being repaired at a local garage at the time she disappeared.
On 19 March 2009 at 5.42am, CCTV footage shows an old-style light coloured Ford Focus hatchback car - manufactured between 1998 and 2004 - driving along Heworth Road.
The investigation team need to trace the owner of a white Vauxhall Astra van that was parked on the opposite side of the road of Claudia's house, towards the Costcutter shop and the fish and chip shop.
The investigation team are appealing for help to locate a man seen on Heworth Road at about 2.30pm on an unknown day the week Claudia went missing.
The forensic re-examination of Claudia's home supports the favoured theory that she left the house on the morning of Thursday 19 March 2009 without any obvious sign of a disturbance at the property.
Update 17 April 2014: The detective leading the review into the Claudia Lawrence investigation has praised the public support for the fresh appeals for information.
Update 25 February 2015: Detectives investigating the disappearance and suspected murder of Claudia Lawrence are carrying out fresh enquiries and searches close to her home.
Update 18 March 2015: Detective Superintendent Dai Malyn, head of North Yorkshire Police's Major Crime Unit, has issued a statement on the sixth anniversary of Claudia Lawrence's disappearance and suspected murder in York.
Claudia Lawrence murder investigation: new CCTV clue released to help identify two people seen near house
Update 18 March 2015: Detectives investigating the disappearance and suspected murder of Claudia Lawrence have screened previously unreleased CCTV footage to help identify two people seen near her home at a potentially significant time.
Update 23 March 2015: Detectives investigating the disappearance of Claudia Lawrence have today arrested a man aged in his 50s from the York area on suspicion of murder.
Update 24 March 2015: A man arrested on Monday 23 March 2015 on suspicion of murdering Claudia Lawrence has today (Tuesday, 24 March) been released on police bail in order to allow detectives time to follow up lines of enquiry.
Update 14 April 2015: Detectives investigating the disappearance and suspected murder of Claudia Lawrence have today (Tuesday 14 April 2015) released a 47-year-old man from bail.
Update 22 April 2015: They are aged in their 50s and from the York area. Searches are being conducted which are expected to be ongoing over a number of days.
Update 23 April 2015: Three men arrested on Wednesday 22 April 2015 on suspicion of murdering Claudia Lawrence have been released on police bail.
Update 17 September 2015: A file of evidence is to be submitted by North Yorkshire Police to the Crown Prosecution Service in relation to four men arrested on suspicion of the murder of missing chef Claudia Lawrence.
Update 8 March 2016: The disappearance and suspected murder of Claudia Lawrence remains unsolved, despite two and a half years of painstaking work by a team of detectives, police staff and national experts who have reviewed the original investigation.
Update 17 January 2017: The three year review by North Yorkshire Police of the investigation into the disappearance and suspected murder of Claudia Lawrence has now moved to a reactive phase which will review any new and compelling information that comes to light.
Update 8 November 2018: Familial DNA forensic investigation work has now been completed in relation to the Claudia Lawrence investigation review.