Retired Orpington businessman, Christopher Tappin, who was extradited to the US over arms dealing charges, will change his plea to guilty, after reaching a deal with prosecutors.
He is set to appear at a Texan court, to enter a plea today.
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Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.
The Old Bailey heard how Syed tried to get weapons online, including a bomb vest, and trawled the web to find a busy area launch an attack.
Hours after completing Sunday's course some of the runners put their medals on auction site eBay, with one attracting bids of almost £92.