A 15-year-old schoolgirl is seen smiling and chatting to the camera in a final Snapchat post, taken moments before she was fatally stabbed in the neck in a row over a teddy bear.
Elianne Andam was supporting her friend in an exchange of possessions after she broke off her relationship with Hassan Sentamu, a trial has heard.
But the meeting outside the Whitgift shopping centre in Croydon turned to tragedy when Sentamu pulled out a knife and stabbed Elianne repeatedly, including once to her neck, Old Bailey jurors were told.
She collapsed at the scene and died within an hour, despite desperate efforts of paramedics to save her life.
Old Bailey jurors have heard Sentamu’s ex-girlfriend – one of Elianne’s close friends – was keen to get her teddy bear back after their relationship ended.
She brought a bag of his clothes to the meeting, but Sentamu – who had armed himself with a kitchen knife – did not bring the bear.
In the Snapchat post, Elianne can be seen smiling into her cameraphone, and says: “We've come to collect the stuff from Hassan yeah, there was meant to be an interchange - she gets her stuff, he gets his stuff - he didn't even bring the stuff.”
Prosecutor Alex Chalk KC said Elianne’s smile turned to “abject terror” before the clip ends.
CCTV played in court shows the shopping centre car park meeting, at around 8.30am on September 27, when Sentamu arrives empty-handed to meet his ex-girlfriend and her friends.
He is handed a plastic bag containing clothes, and the ex-girlfriend – who cannot be named for legal reasons – is heard saying repeatedly “where is my teddy”.
Elianne snatched the plastic bag back and started to walk away, the court heard, in a “gesture of solidarity” for her friend “that cost Elianne her life”.
Sentamu is then seen pulling out the knife he had brought to the scene, and stabbing the teen.
Mr Chalk said Sentamu is likely to rely on his autism diagnosis in his defence, claiming diminished responsibility and a “loss of self-control” blamed on the disorder.
But the prosecutor said it is alleged “white hot anger” was behind Sentamu’s actions, when he felt publicly “disrespected” by teenage girls.
He said autism, and Sentamu’s “disrupted” childhood cannot explain away the stabbing, telling jurors: “Having heard the evidence you may feel that the catalyst for this dreadful attack was rather more simple: anger.
“White-hot anger at having been disrespected in public by girls, both by Elianne on the day of the killing and previously.”
The court has heard Sentamu and his ex-girlfriend broke up ten days before the stabbing. The day before Elianne died, he was doused with water and “teased” outside the same Whitgift shopping centre.
At least one of the girls joked that “tomorrow he would kill them all”, the court heard, and Sentamu allegedly sent a message to his friend that night, saying: “Bro, I can't let this slide.”
Sentamu has admitted manslaughter but denied Elianne's murder on the basis of 'loss of control' because he has autism.
The teenager, of Rowdown Crescent, New Addington, denies murder and possession of an article with a blade or point. The trial continues.
