CNN's Brian Todd, Carol Cratty, Mike Mount, Ed Payne, Scott Bronstein, Ted Rowlands, Tom Cohen, Shawn Nottingham, Susan Candiotti, Deborah Feyerick, Phil Gast and Ben Brumfield contributed to this report.

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CNN's Ted Rowlands contributed to this report from Chicago, CNN's Tom Cohen contributed from Washington and Catherine E.

CNN: Family of slain Chicago teen welcomes gun control debate

CNN's Moni Basu, Brian Todd, Ted Rowlands, Carol Cratty, Mike Mount, Ed Payne, Scott Bronstein, Tom Cohen, Shawn Nottingham, Susan Candiotti, Deborah Feyerick, Phil Gast and Ben Brumfield contributed to this report.

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