It is now six years since Claudia Lawrence disappeared without trace in York. Despite the intensive efforts of the police, the resolve of her heart-broken family and saturated media coverage, her sudden disappearance remains a mystery.
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.
Detective Superintendent Dai Malyn, head of the force's enhanced Major Crime Unit, is leading a comprehensive review of the original investigation.
This has been supported by national experts from other forces and agencies, including forensic specialists who recently completed a re-examination of Claudia's home on Heworth Road in York.
As a result of this work, Det Supt Malyn and his team have identified new lines of enquiry and fresh public appeals to pursue, as well as renewed appeals on previous key items of interest to the investigation.
Detective Chief Superintendent Simon Mason, Head of Crime for North Yorkshire Police, said: "The decision to focus and prioritise the efforts of the enhanced Major Crime Unit on this case and undertake a comprehensive review of the original investigation, is producing progressive results which we expect to continue over time."
Use our interactive map to explore these lines of enquiry and CCTV footage from the investigation. Zoom in and click the hotspots for more information:
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. Please quote "Claudia Lawrence" when passing on details.
The independent charity Crimestoppers has also lent its support by offering a £10,000 reward for information that leads to an arrest and charge. Callers can remain anonymous.
Please pass information to Crimestoppers on 0800 555 111, quoting "Claudia Lawrence, North Yorkshire Police". Alternatively, go to www.crimestoppers-uk.org and fill in an Anonymous Online Form.
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.
Three men arrested on Wednesday 22 April 2015 on suspicion of murdering Claudia Lawrence have been released on police bail in order to allow detectives time to follow up lines of enquiry.
Detectives investigating the disappearance of Claudia Lawrence have arrested three men on suspicion of murder.
Detectives investigating the disappearance and suspected murder of Claudia Lawrence have released a 47-year-old man from bail.
A man arrested on suspicion of murdering Claudia Lawrence has been released on police bail in order to allow detectives time to follow up lines of enquiry.
Detectives investigating the disappearance of Claudia Lawrence have arrested a man aged in his 50s from the York area on suspicion of murder.
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.
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.
Detectives investigating the disappearance and suspected murder of Claudia Lawrence are carrying out fresh enquiries and searches close to her home.
The detective leading the review into the Claudia Lawrence investigation has praised the public support for the fresh appeals for information.
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
This timeline shows events and key lines of enquiry from the days surrounding Claudia Lawrence's disappearance.
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".