Mr Harvey died on 20 August, two days after he was shot in his car
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An 19-year-old man has been arrested in connection with the murder of a East Sussex businessman.
Dale Kenneth Harvey, 45, was shot last month as he sat in his car queuing in traffic at Cripps Corner, north of Hastings.
Sussex Police said they had arrested the 19-year-old, from the London area, on Tuesday.
He is to be questioned at Hastings Police Station later on Tuesday.
Police also said they had started searching for evidence in two addresses and a stretch of water, all in London.
Detective Chief Inspector Reg Hooke described the action as "a significant step forward in the inquiry".
Mr Harvey, who was known as Ken, lived in the nearby village of Broad Oak with his family.
He was shot at 0605 BST on 18 August while travelling to work and died in hospital two days later.