Tsarnaev competes at 201 pounds in the 2009 Golden Gloves Tournament of Champions in Salt Lake City, losing in the first bout.
July 28, 2009
Tsarnaev is arrested, accused of domestic abuse and battery after allegedly assaulting his girlfriend, according to Cambridge Police Department records.
Tsarnaev wins a local heavyweight boxing title. "He said he'd gotten married and had a little baby. He was a very nice guy," said Gene McCarthy of the Somerville Boxing Club in Massachusetts. "I brought him to the registration, and while he was waiting in line, he saw a piano and was playing classical music like it was Symphony Hall."
June 21, 2010
Tsarnaev and Katherine Russell are issued a marriage license by the city clerk in Cambridge, Massachusetts. An attorney for Russell's family, Amato DeLuca, told CNN that the couple have a 2-year-old daughter, whom Tsarnaev cared for while Russell worked long hours as a home health aide.
Tsarnaev begins praying five times a day, his aunt told reporters.
Russia asks the FBI to look at Tsarnaev's activities, a senior U.S. official said.
"The request stated that it was based on information that he was a follower of radical Islam and a strong believer, and that he had changed drastically since 2010 as he prepared to leave the United States for travel to the country's region to join unspecified underground groups," the FBI said in a statement.
After interviewing Tsarnaev and family members, the FBI says it "did not find any terrorism activity, domestic or foreign, and those results were provided to the foreign government."
January 12, 2012
Tsarnaev leaves New York for Russia. It's not clear what he did while in Russia, but Tsarnaev's father has said his son was with him at all times.
Officials have said they're worried about what might have happened on the trip.
"What I'm very concerned about is that when he went over there, he very well may have been radicalized and trained by these Chechen rebels, who are the fiercest jihad warriors," said Rep. Michael McCaul, a Republican from Texas who is chairman of the House Homeland Security Committee.
July 17, 2012
Tsarnaev returns to the United States, arriving at JFK Airport in New York. Travel documents show a photo of him with a beard, according to a U.S. official who declined to be named because of the sensitivity of the issue.
It is unclear whether Tsarnaev made other trips to Russia. On Sunday, McCaul said he thought it was likely Tsarnaev made other trips to the region. "We know he's starting to radicalize in 2009. ... I could speculate that he was probably going over there more often. We don't have -- I don't have the evidence of that just yet. But that's obviously an area of focus," he said. "I know the intelligence community is scrubbing through all their records and that travel is very important, just given who the Chechen rebels are."
Soon after returning from a long visit to Russia, Tsarnaev creates a YouTube channel with links to a number of videos. Two videos under a category labeled "Terrorists" have since been deleted. It's not clear when or by whom.
Analysis by CNN and the SITE Intelligence Institute has uncovered a screen grab from one of those videos. It features members of the group Imarat Kavkaz -- identifiable by the logo on their shirts. Imarat Kavkaz is the most potent militant Islamist group in the north Caucasus, which includes Chechnya and Dagestan.
Tsarnaev also appears to have posted and then removed a video of a militant named Abu Dujana, a jihadist leader who was later killed by Russian troops.