Defendant Azamat Tazhayakov

Defendant Azamat Tazhayakov

Jane Flavell Collins/AP Photo

In this courtroom sketch, defendant Azamat Tazhayakov, center, a college friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev, stands with his attorney in court at the Moakley Federal Courthouse in Boston, on Sept. 13, 2013.