Gunshots, pain and questions. Another mass shooting, this time in D.C. Who was the gunman? How are the wounded doing?

It's Tuesday, and here are the “5 Things to Know for Your New Day."
Every weekday morning around 6, we’ll hit the top five stories of the day and let you know about some of the must-watch stories coming up on CNN’s morning show, “New Day.”

1. Navy Yard shooting

How did this happen?:  He had baggage, not to mention a violent past. He drove to the Navy Yard yesterday with his military contractor ID and parked. He entered a building, perched above an atrium and started firing down. Twelve people died. How did Aaron Alexis make his way into one of America’s most secure places with two rifles and a handgun? That’s one of the many, many questions that linger after the tragic day. Here is what we know.

Chris Cuomo is live from the Washington Naval Yard throughout the show, recapping how this happened and the latest on the investigation. Former FBI negotiator Chris Voss also shares his expertise at 6. John King, CNN chief national correspondent, and Fran Townsend, CNN national security analyst, will also brief us on the investigation at 7.

2. Navy Yard gunman

Quiet. Smart. Angry:  A picture is beginning to emerge of the Navy Yard gunman. But not a motive. He was from New York. He spoke Thai and practiced Buddhism. He worked as a Navy reservist for five years until 2011. He was discharged for misconduct. He couldn’t control his anger. He was arrested before because of guns. But it’s what we don’t know about Aaron Alexis that troubles. Something he may have taken to the grave: Why? Here is what we know about Alexis.

Pamela Brown is live from Washington, D.C., telling you everything we know about the gunman. Retired Navy Cmdr. Kirk Lippold will talk about security concerns at 6. D.C. Mayor Vincent Gray joins us at 7.

3. Navy Yard victims

The dead, the living and the waiting:  The dead ranged in age from 46 to 73. All 12 of them were Navy Yard contractors. Civilians. Eight others were wounded but lived. They’ll be treated like soldiers of war, meaning they can seek treatment at a U.S. military hospital. And like soldiers, those who survived are left with horror stories. A Navy commander says he was standing next to a man who was shot in the head. Others were struck in the legs, the shoulder, the head, and rushed to surgery. But the military said it may take days to account for all the wounded. And at least one woman, Jacqueline Alston, said she was waiting for word about her husband. He is a custodian there. And as of Monday night, she had not heard from him: “Right now, I'm asking God to let me hear that voice, to let me see that man again.” This is the latest on the victims.

https://twitter.com/yassinomar/status/379800211326894080

Rene Marsh will also be live from D.C. throughout the show to tell us what we know about the victims. Dr. Janis Orlowski, from MedStar Washington Hospital, joins us at 8 to give the latest on the victims.

4. Syria

“Indisputable” “war crime”:   The report is in. And now, the United Nations is talking tough. After reading his inspectors’ report, chief Ban Ki-moon said there was “indisputable” evidence that chemical weapons were used against civilians in Syria on August 21. About 1,400 people died, the U.S. says, and Ban called the attack a “war crime.” The world cannot tolerate it, he said. It was the “worst use of weapons of mass destruction in the 21st century,” he said. So who committed the attack, Syrian President Bashar al-Assad or the rebels? That, the report won’t say. But it did say the rebels don’t have the rockets that were used to transport the deadly sarin. So what’s next? Some countries will push for the U.N. to OK a plan to dismantle Syria’s chemical weapons. Some will not.  This is what you need to know about Syria.

Jim Acosta reports from the White House on Syria and the pending chemical weapons deal at 7.

5. Bill Clinton

The secretary of explaining stuff:  That is what President Obama calls Bill Clinton. And now, the former president stops by to explain Obama’s Syria policy to CNN's Fareed Zakaria. Clinton gives his take on dealing with Russia. He answers whether Russian President Vladimir Putin can be trusted and whether it’s a good thing to arm the rebels. Tune in for these surprising answers.  Here is where that "secretary of explaining stuff" title came from.

Parts of the Clinton interview with Zakaria air at 8. The full interview will air on “Fareed Zakaria GPS” this Sunday at 10 a.m. ET and again at 1 p.m.

Those are your five biggies for the day.

There you go. All you need to know to get an early start to your morning.
Be sure to tune in to "New Day" from 6 to 9 a.m. ET. Join us at NewDayCNN.com, and go and have a GREAT NEW DAY!