A teenager who was pictured "flaunting" the fake Rolex watch of a man he stabbed to death hours beforehand has been found guilty of murder.
Aron Warren, 18, was attacked by the 16-year-old after answering a knock at the door of his south London flat on 8 December, the Old Bailey was told.
The court previously heard the killer was "envious" of Mr Warren's lifestyle.
Judge Paul Dodgson described the defendant as being "very dangerous at this stage in his life".
The trial heard from a witness, who cannot be identified because of his age, who had been playing a computer game in Mr Warren's Greenwich flat at the time.
He said after the person knocked at the door, he heard Mr Warren groan and "saw a big knife with blood on it".
The witness told the court: "I stood up and he says to Aron 'where's your money," before later being asked to "pack up the PlayStation and put it on the sofa".
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Prosecutor James Mulholland QC told the jury that after the stabbing, the boy, who is now 17 but cannot be named for legal reasons, stole two large hunting knives in their sheaths and a fake Rolex watch from the flat.
The knives were recovered when police arrested the teenager four days later.
Police also found an iPad in his bedroom which contained a photograph of the defendant wearing the watch, the court heard.
Det Insp Brett Hagen, from the Metropolitan Police, said: "It remains shocking that the attacker was only a 16-year-old teenager when he committed murder.
"Despite his age, he acted with extreme violence and certainly without conscience or morality even to the extent of flaunting the victim's Rolex watch less than five hours after the murder."
The boy was also convicted of having an article with a blade or point.
He was found not guilty of robbery and will be sentenced on a date to be fixed.
Judge Paul Dodgson asked for psychiatric and psychological examinations to be completed before passing sentence.