Twelve families are grieving for those who were killed in Monday's mass shooting.
The dead were devoted parents, spouses, and siblings.
Erin Burnett pays a tribute to the victims of the Navy Yard shooting rampage.
As investigators piece together Aaron Alexis' history, the big question: how did the shooter, a man with a history of mental health issues, arrests and gun violations get and keep the security clearance needed to enter the Washington Navy Yard.
Navy Yard gunman's psychological issues, motive focuses after shooting
Drew Griffin has the latest in this Outfront investigation.
Defense Secretary Chuck Hagel and senior military leaders are reviewing not only security measures at all military installations, but also whether security clearances for its contractors are sufficient.
OutFront: Republican Congressman Michael McCaul - he's the chairman of the house homeland security committee.
One of the largest air rescue operation since Hurricane Katrina is underway in Colorado after a break in what has been a relentless onslaught of rain.
Currently, there are approximately 600 people still stranded by the waters. Their food and water running dangerously low. But for those who have already been rescued the grim reality is now setting in that they must begin task of cleaning up and rebuilding.
Ana Cabrera is OutFront.
Newly released 9-1-1 tapes are shedding light on what happened on Saturday morning, when Jonathan Ferrell, a former Florida A&M football player, was shot and killed by a Charlotte, North Carolina police officer.
Charlotte police kill ex-FAMU player who may have been running to them for help
The officer was charged with voluntary manslaughter.
A police investigation found Ferrell was unarmed and might have actually been approaching the officer for help after crashing his car.
Alina Machado is OutFront.