Timeline of events: MIT fatal cop shooting, Watertown shootout

POSTED: 2:48 AM PDT April 19, 2013    UPDATED: 4:32 AM PDT April 19, 2013 
Suspects in Bombings

Violence terrorized Bostonians overnight, and police believe two suspects involved are the same men who allegedly planted bombs that killed three in the Boston Marathon Monday.

One was shot dead early Friday, and the other is still on the loose, authorities said. A massive manhunt was underway for another man believed to be tied to the bombing.

Here's a breakdown of how events have unfolded. (Times are Eastern)