Now from Times Square, here's what you need to know.

And a good afternoon to you and welcome to what you need to know on this Tuesday.

Unfortunately, the nation's still in shock after that school shooting in Wisconsin.

Yeah, and Dr. Darien, as a doctor, you know, for parents, how do you approach your children?

Because this is a subject that is going to come up in a lot of people's homes.

And continue to, unfortunately. It's a public health issue. And as Dr. Murthy declared it this past June, a public health crisis.

As gun violence is the leading cause of death for children in adolescence and unfortunately, a uniquely American problem.

So no doubt, children will have questions. And when they do, you should lead conversations with ensuring their safety, reminding young children about who's here

to protect them and then let them ask the questions.

When I talk to psychologists and pediatric psychotherapists, they often talk about if a child

is old enough to ask a question, they're old enough to get an answer.

You make sure that answer is age appropriate and then pay attention to their emotions. Something I've learned through my pediatric training is that children, when they're old enough to get an answer. You make sure that answer is age appropriate and then pay

attention to their emotions. Something I've learned through my pediatric training is that children

when they're anxious, they often exhibit it by acting out. So making sure you're taking account

of that, reflecting on their emotions, and allowing them space to speak.

Wow, the times we are living in. All right, Doc. Thank you very much. We appreciate it.

Let's check out with ABC's Christa on Cordero in Washington with a look at today's headlines. Good to see you, Frank.

Good to see you, too, DeMarco. We'll begin with another community in shock, that deadly shooting in

Wisconsin. After police say a teenage girl opened fire at a private K-12 Christian school in Madison, a teacher and a student killed during study hall, others wounded.

Police say the 15-year-old shooter died of a self-inflicted gunshot wound, the motive under investigation.

Police looking into her social media accounts. And the developing headline out of Long Island, New York,

law enforcement sources telling ABC News suspected killer Rex Huberman is being charged with a seventh

...