Tamerlan Tsarnaev, 26, was killed in a shootout with police after a wild police chase through the suburbs. His brother, 19-year-old Dzhokhar, was able to escape. The brothers are believed to be Chechen.
As authorities search for the younger brother, the city and its surrounding areas are virtually shut down.
The New York Times has a full timeline of the events; each seems more outrageous than the next.
The remains a very fluid situation — one that hopefully resolves itself without any more bloodshed sooner rather than later.