Boston Marathon Bomber's Friend Withdraws Appeal

Azamat Tazhayakov, one of the convicted friends of the Boston Marathon bomber, withdrew his appeal Thursday, according to court documents.

Tazhayakov was sentenced early last month to three and a half years in federal prison for covering up evidence in the April 2013 terror investigation.

Prosecutors say Tazhayakov took evidence, including a backpack, fireworks and a laptop, out of Dzhokhar Tsarnaev's dorm room at the University of Massachusetts Dartmouth and disposed of it as authorities released images of Tsarnaev and his now-deceased brother, Tamerlan.

Tsarnaev was formally sentenced to death last week for his role in the Boston Marathon bombing that killed three people and injured more than 260 others.

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