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A chronology shows how the investigation has developed since the presenter was shot outside her home.
26 April - Ms Dando is shot once in the head on the doorstep of her home in Gowan Avenue, Fulham, south-west London.
Despite emergency treatment at the scene and at Charing Cross Hospital, Ms Dando is certified dead at 1303 BST.
Detectives launch a murder inquiry, focusing on a smartly dressed man carrying a mobile telephone seen walking calmly but briskly from the scene.
27 April - Scotland Yard reveals that Ms Dando was killed by a shot to the side of the head at very close range from a 9mm semi-automatic pistol.
There are several sightings of the suspect, who may have disguised himself with heavy black-framed spectacles.
30 April - Police release an E-fit of the prime suspect. DCI Hamish Campbell, leading the murder inquiry, releases CCTV footage showing a metallic blue Range Rover on Fulham Palace Road travelling south shortly after the killing.
2 May - Police release CCTV footage from the morning of Ms Dando's murder, showing her shopping in the Kings Mall shopping centre at Hammersmith.
5 May - An inquest opens, and DCI Campbell discloses that the prime suspect made his getaway on a number 74 bus. He spoke on a mobile telephone before getting off at Putney Bridge.
10 May - It emerges that Scotland Yard is to appoint senior detectives to review the inquiry, Operation Oxborough.
18 May - Crimewatch features a reconstruction and appeals from Mr Farthing. The show generates 500 calls from the public.
21 May - Mourners including Prince Edward's fianceé Sophie Rhys-Jones attend Ms Dando's funeral at Weston-super-Mare.
28 May - Detectives release a man arrested at his home in connection with the inquiry.
9 June - The inquest is adjourned for three months following a hearing at Fulham Coroners Court.
6 July - Ms Dando left more than £1m - but no will. Her estate, worth £1,181,207 pre-tax, passes to her father Jack, 81.
29 July - Police reveal there were six distinctive and unique marks on the cartridge case of the killer bullet.
3 August - The 100th day of the police investigation.
The Sun newspaper announces it is offering a £100,000 reward to help catch Ms Dando's killer. The reward brings the total on offer to £250,000.