Dzhokhar Tsarnaev was convicted Wednesday on all 30 counts related to the Boston Marathon bombing and the killing of a police officer. Here's a look at the four people who lost their lives in the attacks.

A man linked to a gun used to kill a university police officer after the Boston Marathon bombing allegedly told police he smoked marijuana every day because, in his words, "my best friend was the bomber."

A man believed to have provided the gun used by Boston Marathon bombing suspects to kill a college police officer is in custody on drug and weapon charges.