By David Mercer, news reporter
A man has been arrested on suspicion of murdering a shopkeeper who was stabbed to death during a robbery at a newsagent's.
Ravi Katharkamar, 54, was attacked as he opened up Marsh Food and Wine in Pinner, northwest London, on Sunday morning.
Police said the attacker fled with the shop's till and a passer-by found Mr Katharkamar collapsed inside the shop.
He died at the scene and a post-mortem examination confirmed the cause of death was a stab wound to the chest.
A 44-year-old man was arrested in Harrow, northwest London, on Wednesday and remains in custody, Scotland Yard said.
Detective Chief Inspector Simon Stancombe said: "This was a vicious and unwarranted attack on a completely innocent man.
"Ravi's attacker got away with a few pounds worth of coins, but he leaves behind a family utterly devastated and a close-knit community asking who could do such a thing."
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Police say the shop till may have been discarded and have appealed for anyone who finds it to come forward.
Detectives would like to speak to people who saw a black Vauxhall Astra driven away at speed following the stabbing, which happened at about 6am on Sunday.
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