Teen ‘stabbed man to death during drug deal’

A teenage killer claims he stabbed a shop assistant to death to protect himself after the 21-year-old swung a child’s rounders bat at him in a park. David Darko was found clutching the small wooden club, emblazoned with the words ‘Baseball Star’, after he was left for dead by Darnell Martin and Joshua Asante, both 19, the Old Bailey heard. He was found injured by a member of the public in South Norwood Recreation Ground but despite the desperate attempts…