More: Neil Heslin tells Senate December 14, the day of the Newtown shooting when his son died, was the worst day of his life - broadcast

Live video: Newtown residents, politicians and community leaders gather to remember Sandy Hook victims - @NBCNews

Photo: Daylong reading of the names of all 4,800 people killed by guns since Newtown, Conn., school shooting - @jbendery

Sen. Reid on guns bill: 'If somebody has an idea that doesn't weaken the bill, I'll be happy to talk to them. At this point, I've got nothing' - @mpoindc

Obama, Biden to meet today with families of Newtown, Conn., shooting victims in advance of tomorrow's 6-month anniversary of the tragedy, White House says - @markknoller

Live video: Families, friends of Newtown, Conn., shooting victims gather at the US Capitol for day-long event - @NBCNews

House Speaker Boehner, House Majority Leader Cantor to meet with families of Newtown, Conn., shooting victims, spokesman says - via @NBCNews

Threat prompts brief lockdown of Newtown, Connecticut, schools - @AP

Photo: Connecticut Gov. Malloy signs bill protecting grieving Newtown families - @AndrewDoba

Connecticut General Assembly approves legislation to prevent public release of homicide victim photos, videos, audiotapes in response to Sandy Hook shooting - @Reuters

Connecticut lawmakers who passed gun control measures in response to Sandy Hook revise gun control legislation - @AP

More: Neil Heslin tells Senate December 14, the day of the Newtown shooting when his son died, was the worst day of his life - broadcast

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More: Neil Heslin tells Senate December 14, the day of the Newtown shooting when his son died, was the worst day of his life - broadcast

Live video: Newtown residents, politicians and community leaders gather to remember Sandy Hook victims - @NBCNews

Photo: Daylong reading of the names of all 4,800 people killed by guns since Newtown, Conn., school shooting - @jbendery

Sen. Reid on guns bill: 'If somebody has an idea that doesn't weaken the bill, I'll be happy to talk to them. At this point, I've got nothing' - @mpoindc

Obama, Biden to meet today with families of Newtown, Conn., shooting victims in advance of tomorrow's 6-month anniversary of the tragedy, White House says - @markknoller

Live video: Families, friends of Newtown, Conn., shooting victims gather at the US Capitol for day-long event - @NBCNews

House Speaker Boehner, House Majority Leader Cantor to meet with families of Newtown, Conn., shooting victims, spokesman says - via @NBCNews

Threat prompts brief lockdown of Newtown, Connecticut, schools - @AP

Photo: Connecticut Gov. Malloy signs bill protecting grieving Newtown families - @AndrewDoba

Connecticut General Assembly approves legislation to prevent public release of homicide victim photos, videos, audiotapes in response to Sandy Hook shooting - @Reuters

Connecticut lawmakers who passed gun control measures in response to Sandy Hook revise gun control legislation - @AP