Her throat was then cut but the knife failed to hit the main artery and Miss Kercher died a slow agonising death.
Earlier today it emerged that police are also looking for a fourth person in connection with the crime.
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The developments came after a judge ruled that the three people already remanded over the killing will be held in custody for up to a year.
In a 19-page document, Judge Claudia Matteini decided that there is enough evidence to keep Amanda Knox, 20, Raffaele Sollecito, 23, and Patrick Lumumba, 37, in prison, pending formal charges and a trial.