Tamerlan died four days later after a shootout with police, while Dzhokhar is in custody.
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Todashev was from the Chechnya region, as were Tamerlan and Dzhokar Tsarnaev, the source said.
Tamerlan died in a manhunt four days after the Boston Marathon, the oldest in the country.
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Tamerlan Tsarnaev lived with his wife and their young daughter in an apartment in Cambridge, Massachusetts.
One of two bombing suspects, Tamerlan Tsarnaev, died after a gunfight with authorities four days later.
Relatives of ex-boxer Tamerlan Tsarnaev, 26, have been making arrangements to bury his body.
For nearly two weeks, Tamerlan Tsarnaev's body lay unclaimed at the Boston medical examiner's office.
Ms. Herlihy, who speaks Russian and helped tutor the children, said Tamerlan's boxing dreams eventually crumbled.
Tamerlan came up with money for the trip and unexpectedly left for the Russian region.
Tamerlan Tsarnaev died after a gun battle with police early in the morning on April 19.
Authorities say Tamerlan Tsarnaev and his younger brother, Dzhokhar, also killed a police officer.
The officer took up a position on the side and fired at Tamerlan and Dzhokhar.
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Tamerlan Tsarnaev was an ardent reader of jihadist websites and extremist propaganda, officials have said.
Neighbors say that Tamerlan's death seems only to have accentuated Ms. Tsarnaeva's devotion to Tamerlan.
"He was really nice, " she said of Tamerlan at a press conference earlier this week.
During the harrowing ride, Danny did various things to convince Tamerlan to spare his life.
It isn't clear which country's passport Tamerlan, who wasn't a U.S. citizen, used to travel.
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Yet Tamerlan left last summer without picking up a Russian passport that he had been granted.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
Despite the violence in Dagestan, Tamerlan Tsarnaev "didn't want to leave, " his father said.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
Tamerlan stayed in a ground-floor apartment that his father bought in a simple residential neighborhood.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
Tamerlan Tsarnaev, 26, was killed in a firefight with police four days after the bombings.
Tamerlan died after a shootout with police on Thursday night, and Dzhokhar was captured on Friday.
He said Tamerlan told him that a Muslim must not punch another man in the face.
"They described Tamerlan as very controlling and very manipulative of their friend, " Sullivan said.
Mr. Carney defended the FBI, which in 2011 interviewed Tamerlan Tsarnaev at the request of Russia.
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Tamerlan Tsarnaev was killed in a shootout with police in Watertown early on Friday morning.
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While he would tag along to Tamerlan's boxing practices, the younger brother was into wrestling.
If Tamerlan recorded his thoughts, they have not yet surfaced at least publicly.
It did say that Tamerlan Tsarnaev had been on the FBI's radar in the past.
The FBI interviewed Tamerlan Tsarnaev in early 2011 at the request of the Russian government.
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