During the Boston Marathon on April 15, 2013, two pressure cooker bombs exploded at 2:49 pm EDT, killing 3 people and injuring an estimated 264 others.
This act of terrorism happened one year ago today. Because of the televised coverage of the marathon on ESPN, the tragedy entered the Toobworld Dynamic immediately.
But it would not be until August 27th, 2013 when the marathon bombing officially entered the History of Earth Prime-Time as a fixed point in Time. That night it was mentioned by a bomb tech police investigator as a point of reference for a case he was working on. It was sadly too easy for his audience to get the reference, since they were all working for the Boston Police Department.
'RIZZOLI & ISLES'
"BUILT FOR SPEED"
As far as I can tell, there were no other references to the Bostom Marathon bombing in a fictional context before that. (Since then I have heard it mentioned on 'Law & Order: SVU'.)