It's just overwhelming. A little boy sees a road rage killer open fire, shooting his

mommy and his siblings. I find it really hard to believe that a mother, Megan Bigelow,

41 years old, with our all-vert children in the car is going to be weaving in and out

and traffic having a road rage confrontation. What happened? What happened in the parking

lot of the local dentist?

Crime Stories with Nancy Grace

When I came out the back door to see what was going on, I witnessed the

gentleman that had been shot multiple times up against the building right here.

He was very concerned about his daughter's whereabouts. He'd been shot multiple times.

He did say there was a lady just right in front of this building here that had been shot in the head

and it looked like that she was probably faced down on the concrete. He was trying to tell the police to go check her.

They called him. I said, come here, come here, come here. And he said, I want to go over there. My mom just got shot.

Oh, my stars. A little boy witness says a road rage killer opens fire on the boys' family

killing his 13-year-old brother, shooting his mom and sibling. Good. Gravy.

I'm Nancy Grace. This is Crime Stories. Thank you for being with us. You were just hearing from our friends at nine

news in Denver with me and all star panel to break it apart and put it back together again.

Ashley Wilcott, judge trial lawyer anchor at court TV. You can find her at Ashley Wilcott.com.

Stephen Lampley, detective and author of Outside Your Door on Amazon. Dr. Debbie Jaffy Ellis, psychologist,

adjunct professor Columbia University. Karen Smith joining me from the Florida jurisdiction for an expert founder of Bear Bones Consulting.

But right now to Dave Matt, crime online.com investigative reporter road rage ends in a shooting death. Tell me what happened.

Nancy, a headline here actually explains what happened. You've got a mom and her three boys going to an afternoon dental appointment.

You've got traffic on the road and Mrs. Bigelow is trying to move to her right to get out of the way for an emergency vehicle that's trying to pass.

...