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Two hundred people have now been struck off and another 120 others are being treated as low priority.
Those under investigation include about 50 fans who wrote to the presenter at the BBC in the months before her death.
![[ image: width=150]](/olmedia/440000/images/_443044_dando150.jpg)
But detectives are certain that she was not stalked or subjected to any other physical harassment.
The most obsessed fans, some of whom wrote to her nine times, have already been eliminated from enquiries.
Detectives said they were typically single men in their late 20s or 30s. Some had decorated their homes with pictures of the presenter.
Still no motive
They are now checking out everyone else who wrote repeatedly to the presenter, as well as people named as potential suspects by members of the public, and friends and acquaintances of Miss Dando.
Ten of Miss Dando's former boyfriends have also been ruled out of carrying out the shooting.
But detectives are also investigating whether any of the suspects could have been involved in a conspiracy to commit the murder, although they have not yet established a motive for the attack.
It is still assumed that the presenter was the victim of an obsessive fan, or a contract killing.
Vehicle appeal
Detectives have focused their investigations on the last two years of her life, as they believe they are most likely to provide an explanation for her death.
The 486 people listed in her Filofax are being checked out.
Scotland Yard has also launched a new appeal for information about the murder, and are offering a £250,000 reward.
Detective Chief Inspector Hamish Campbell appealed for information about any vehicles linked to the crime and details about the weapon used.
Anyone with information is urged to call the incident room at Kensington Police Station on 0181 246 0732 or Crimestoppers on 0800 555 111.
Northern Ireland
Scotland
Wales
England
BBC will screen Dando's last show
(13 Jul 99 | Entertainment)
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(06 Jul 99 | UK)
Dando murder case reviewed
(28 Jun 99 | UK)
Jill Dando murder...50 days on
(09 Sep 99 | UK)
Top detective joins Dando inquiry
(24 May 99 | UK)
Your tributes to Jill Dando
(26 Apr 99 | UK)
Clues to the Dando murder
(10 May 99 | UK)
Plea to underworld for Dando killer
(27 Apr 99 | UK)
The 'Golden Girl' of TV
(26 Apr 99 | UK)
MPs remember Dando
(26 Apr 99 | UK)
BBC 'devastated' by Dando's death
(26 Apr 99 | UK)
Jill Dando dies after attack
(26 Apr 99 | UK)
Jill Dando tribute page
Scotland Yard
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