Boy, 16, killed woman after inhaling laughing gas

A 16-year-old boy has been found guilty of the manslaughter of a woman during a row after they both inhaled laughing gas on Christmas Eve.

The youth had a physical fight with Kacey Clarke, 22, and then stabbed her in the chest at a flat in Bermondsey, south-east London.

Earlier that evening he was caught on CCTV threatening to “ching her up" and kill her, the Old Bailey heard.

Both Ms Clarke and her killer had a history of inhaling nitrous oxide – commonly known as laughing gas – which was classified a class C drug in November 2023. The boy, who cannot be named because of his age, will be sentenced at a later date.

After the killing, the teenager hid the weapon – a large knife – in a railway arch where it was discovered by a Thames Water workman.

The court heard he had a history of possessing knives, having previously been caught with a 25cm long Rambo-style blade in an ice cream shop and a lock-knife in his waistband in a residential area.

Giving evidence, the boy admitted he had taken laughing gas and claimed he had acted in self-defence by waving a knife to create an “invisible shield”.

He said he could not remember a moment of impact when the knife went into Ms Clarke's chest.

He was convicted of manslaughter after being cleared of the more serious charge of murder.

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