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ORLANDO, FL - MAY 4:  In this booking photo provided by the Orange County Sheriff's Office, Ibragim Todashev poses for his mug shot after being arrested for aggravated battery May 4, 2013 in Orlando, Florida. Todashev was being questioned by the Federal Bureau of Investigation (FBI) on May 22, 2013 about his ties to the Boston Marathon bombing suspects when he was killed by an FBI agent after attacking the agent.  (Photo by Orange County Sheriff's Office via Getty Images)
ORLANDO, FL - MAY 4:  In this booking photo provided by the Orange County Sheriff's Office, Ibragim Todashev poses for his mug shot after being arrested for aggravated battery May 4, 2013 in Orlando, Florida. Todashev was being questioned by the Federal Bureau of Investigation (FBI) on May 22, 2013 about his ties to the Boston Marathon bombing suspects when he was killed by an FBI agent after attacking the agent.  (Photo by Orange County Sheriff's Office via Getty Images)

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A friend of Tamerlan Tsarnaev was killed by FBI during questioning. His father wants answers. Susan Candiotti reports.

Father demands answers in son's killing

A friend of Tamerlan Tsarnaev was killed by FBI during questioning. His father wants answers. Susan Candiotti reports.