article_snippet.sent: Dzhokhar Tsarnaev, an ethnic Chechen, was .
article_snippet.sent: But Dzhokhar said Tsarnaev started going downhill in college.
article_snippet.sent: Tsarnaev's family arrived in Boston.
article_snippet.sent: It is not clear exactly which members of Tsarnaev's family traveled .
article_snippet.sent: Chinese exchange student Lu Lingzi, 23, . and restaurant manager Krystle Campbell, 29, died in the Boston bombing.
article_snippet.sent: Tsarnaev's family shot dead Massachusetts Institute .