Vipaul Prasanna was commuting to Brixton via Wembly Park when the attack occured. He was accused of stepping on his killer's son's foot and was hit in the face when he tried to appologise. He died later in hospital from his injuries.
Police are on the lookout for a man and his son - described as black, in his twenties and of powerful build, wearing a white long-sleeved top with dark trousers and a dark-coloured baseball cap. His son, who is about 10, was wearing a camouflage cap with his hair sticking out at the back.
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