One of the most memorable events was the marathon, which took place during a July heatwave.
Images from the bombing site on the day of the marathon may also provide clues.
He said a lot of people from Scotland had been taking part in the marathon.
Ruslan Tsarni, who lives in Maryland, had called the alleged bombers "losers, " after the marathon attacks.
Champion athlete Liz McColgan, who won the marathon in 1996, said some runners were in trouble.
Kerry himself often fires the starting gun for the wheelchair race at the marathon.
Efforts to spin the marathon as a symbol of the city's post-storm comeback got no traction.
It will mark the first time the marathon won't be run since it started in 1970.
In recent days, calls to cancel the marathon had gained steam on social media.
Massachusetts State Police officials at first thought the shooting was unrelated to the marathon bombings.
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The men are shown in the images walking together near the marathon finish line.
He was one of eight Austin-area runners who ran the marathon with that group.
Reporters covering the marathon generally work from race headquarters in the Fairmont Copley hotel.
"There is something magic inside the marathon because everybody is the same level, " says Sepulchre.
Richards, who finished fourth, was also the first British woman to complete the marathon round-the-world event.
Malcolm Sutherland, Loch Ness event director, said the marathon has attracted a record number of entries.
Special projects like the football camp and the marathon require 30 hours of work a week.
He was beaming with pride on a recent Sunday afternoon when the marathon took place.
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In the first modern Olympiads, for example, the length of the marathon was inconsistent.
"I thought, since I'm there, I may as well do the marathon, " he says.
The NYC marathon winner will run the marathon in less time than the average (gas) lines.
And experts predict that women could soon outperform men in long-distance swimming and the marathon.
Yet investigators hope they can better piece together the suspected bombers' movements before and after the marathon.
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At the time, he acknowledged that the marathon finish line was a "soft target" for the bombers.
St James's Palace said Prince Harry would still attend the marathon to make presentations to the winners.
Authorities asked for amateur cell phone photos and videos from anyone who had been at the marathon.
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Late Thursday, the FBI released pictures and videos taken from security cameras near the marathon's finish line.
He has repeatedly noted the marathon's ability to bring business and tax revenue to the city .
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Meanwhile, Thom Kenney, a 43-year-old Army veteran who recently returned from Afghanistan, had just finished the marathon.
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