Tamerlan Anzorovich Tsarnaev and his brother Dzhokhar Tsarnaev planted bombs at the Boston Marathon on April 15, 2013.

The bombings killed three people and reportedly injured as many as 264 others. Tamerlan was half-Chechen and half-Avar.

 He and his family immigrated to the United States as refugees in 2002. At the time of the bombings, Tamerlan was an aspiring boxer who authorities believe had recently become a follower of radical Islam.

Shortly after the Federal Bureau of Investigation declared them suspects in the bombings and released images of them, the Tsarnaev brothers killed an MIT police officer, carjacked an SUV, and engaged in a shootout with the police in the Boston suburb of Watertown. According to the federal indictment, during the shootout Tamerlan was captured, but died partly as a result of his brother driving over him, and an MBTA police officer was critically injured in the course of Dzhokhar's escape in the SUV (the latter by what may have been friendly fire).

 An injured Dzhokhar escaped, but was found, arrested, and hospitalized on the evening of April 19 after an unprecedented manhunt in which thousands of police searched a 20-block area of Watertown.

During his incarceration, Dzhokhar allegedly said during questioning that he and Tamerlan next intended to detonate explosives in Times Square in New York City.

 Dzhokhar reportedly also said to authorities that he and his brother were radicalized, at least in part, by watching Anwar al-Awlaki lectures.

 ABC reported on April 23, 2013, that authorities linked Tamerlan to an unsolved triple homicide in nearby Waltham that took place around the 10th anniversary of the September 11 attacks.

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The Tsarnaevs were forcibly moved from from Chechnya to the Soviet republic of Kyrgyzstan in the years following World War II.

Anzor Tsarnaev is a Chechen, and Zubeidat Tsarnaeva is an Avar. The couple had two sons, Tamerlan, born in the Kalmyk Autonomous Soviet Socialist Republic in 1986, and Dzhokhar, born in Kyrgyzstan in 1993. The parents also have two daughters.

 Anzor is a traditional Muslim who reportedly shuns religious extremism and raised his children Muslim.

 According to some, other Chechen Americans in the area apparently did not consider the American branch of the family to be fully Chechen because they had not ever lived in Chechnya.

As children, Tamerlan and Dzhokhar lived in Tokmok, Kyrgyzstan.

 In 2001, the family moved to Makhachkala, Dagestan, in the Russian Federation.

 In April 2002, the Tsarnaev parents and Dzhokhar went to the United States on a 90-daytourist visa.

 Anzor Tsarnaev applied for asylum, citing fears of deadly persecution due to his ties to Chechnya.

Tamerlan was left in the care of his uncle Ruslan in Kyrgyzstan, and arrived in the U.S. around two years later.

 In the U.S. the parents received asylum and then filed for their four children, who received "derivative asylum status". They settled on Norfolk Street in Cambridge, Massachusetts. Tamerlan lived in Cambridge on Norfolk Street until his death.

The family was in "was in constant transition" for the next decade. Anzor and Zubeidat Tsarnaev both received welfare benefits. The father worked as a backyard mechanic and the mother worked as a cosmetologist until she lost her job for refusing to work in a business that served men. In March 2007, the family was granted legal permanent residence.