As the investigation continues into the , more names are being added to the story. Here's a guide that we'll keep updating, with links to relevant posts or stories. As always, if new information comes in that changes what is being said about anyone, we will pass that along:
THE VICTIMS
The three people killed by the blasts were of Dorchester, Mass.; 23-year-old ; and 29-year-old .
On April 18, MIT police officer . Authorities say one of the two main suspects in the bombing was responsible.
On April 19, MBTA Transit Police Officer Richard Donohue was seriously wounded during a gun battle with the two suspects in Watertown, Mass. that he expects to make a full recovery.
More than 250 people were injured by the explosions. Among the stories NPR has done about them: " ." The Boston Globe is among several news outlets that have also been telling their stories: " ."
THE SUSPECTS
, 19, is the younger of the two brothers who authorities say planted the bombs near the marathon's finish line and later in the week killed Officer Collier. Tsarnaev is charged with using a weapon of mass destruction. He became a U.S. citizen in 2012.
, 26, died April 19 from injuries he sustained during a gun battle with police in Watertown, Mass. Among the things investigators are looking into is whether he made contact with Muslim extremists during trips to visit his parents in Russia. The Tsarnaev family, ethnic Chechens, came to the U.S. about a decade ago. But the parents later left the U.S. Tamerlan Tsarnaev was a legal resident of the U.S. who once hoped to be an Olympic boxer.
THE FAMILY
is Tamerlan Tsarnaev's American-born wife. Her attorney says she knew nothing about the bombings beforehand and that she is cooperating with investigators.
Zubeidat Tsarnaev is the mother of the two suspects. From Dagestan, where she has been living, she has insisted her sons are innocent. It has also been reported that she encouraged Tamerlan Tsarnaev to embrace Islam, and she with him during a 2011 phone conversation that was recorded by Russian authorities.
is the suspects' father. He, too, is in Dagestan and has said he does not believe his sons were responsible for the bombings.
For a detailed account of the Tsarnaev family's "faded ... American dream," see .
THE FRIENDS
Mikhail Allakhverdov (Misha), is an Armenian-born man living in Rhode Island. Some of the Tsarnaev brothers' family members have accused Allakhverdov of encouraging Tamerlan Tsarnaev to embrace radical Islam. Allakhverdov, though, and would have tried to stop the bombing plot if he had known about it.
Dias Kadyrbayev and Azamat Tazhayakov of Kazakhstan, and Robel Phillipos of Cambridge, Mass., are former classmates of Dzhokhar Tsarnaev's at the University of Massachusetts Dartmouth. All three are 19 years old. Kadyrbayev and Tazhayakov have been accused of throwing out key evidence — a laptop and empty fireworks canisters — that could link Dzhokhar Tsarnaev to the bombings. Robels is accused of lying to the FBI about what the friends allegedly did. There's .
KEY WITNESSES
is the Watertown, Mass., man who alerted police when he discovered someone hiding in the boat stored in his backyard. That individual turned out to be Dzhokhar Tsarnaev.
"Danny" is the Chinese engineer turned entrepreneur who , when they commandeered his SUV. Taking Danny with them, they went to ATM machines to get cash. When they stopped for fuel at a gas station, he was able to escape. Because he left his cellphone in the vehicle, police were able to quickly track the SUV to Watertown, where the gun battle occurred.
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