A teenager accused of stabbing a 17-year-old to death in Halifax watched stabbing videos days before the killing.
Jamie Brown died from a single wound after being attacked at a Halloween party in Ovenden, Halifax, on 27 October.
The accused, also 17, who cannot be named, denies murder and an alternative charge of manslaughter.
Leeds Crown Court heard he looked at a graphic video of a man being stabbed to death in a jail "out of curiosity".
He also denies wounding with intent, violent disorder and possession of an offensive weapon.
Three other youths also face charges.
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