Doorbell footage of Brianna Ghey leaving her home for the last time on the day she died has been shown to a jury.
Brianna, 16, who was transgender, was stabbed 28 times in Linear Park in Culcheth, Cheshire, on 11 February.
Two teenagers, identified only as girl X, from Warrington, and boy Y, from Leigh, deny her murder.
The footage shows the schoolgirl looking at her mobile phone as she checked the door was locked before walking down the path and out of the gate.
The trial continues.
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