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 Dzhokhar Tsarnaev during testimony of Officer Thomas Barrett, who picked up Leo, 3, after Boston Marathon bombing.
 Dzhokhar Tsarnaev during testimony of Officer Thomas Barrett, who picked up Leo, 3, after Boston Marathon bombing.

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    Key evidence from Tsarnaev trial released to public

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Key evidence from Tsarnaev trial released to public

Surveillance video showing moment MIT officer was killed was shown to the Tsarnaev jury, released to public. CNN's Deborah Feyerick reports.

Key evidence from Tsarnaev trial released to public

Surveillance video showing moment MIT officer was killed was shown to the Tsarnaev jury, released to public. CNN's Deborah Feyerick reports.