Watch CNN.com Live for continuing coverage of the investigation and fallout from Monday's fatal bombings at the Boston Marathon.
Today's programming highlights...
Continuing coverage - Texas fertilizer plant explosion
The Jodi Arias trial resumes on Tuesday, April 23
9:30 am ET - Astronaut spacewalk - Two astronauts venture outside the International Space Station to deploy and retrieve science experiments and install a navigational aid.
10:00 am ET - Immigration overhaul hearing - Homeland Security Secretary Janet Napolitano testifies before a Senate committee on comprehensive immigration legislation.
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