Bill Hemmer is reporting live this morning from Boston Common as the Boston Marathon is being run for the first time since last year's bombing.

'All Hell Broke Loose': Hemmer Talks to Two Brothers Severely Wounded in Boston Bombing

He discussed the tragic day with one of the heroes who was first on the scene to help the victims. Dr. Natalie Stavas, a pediatrician, was running the race when the bombs went off near the finish line on Boylston Street.

When she heard the explosions, she cut through a public alley in an effort to get there as fast as she could.

"I ran toward it, but I didn't know what I was running towards. How could I fathom something so evil?" she recalled. Stavas said the first thing she did was perform CPR on a wounded woman, who she later found out was one of the three who died.

Even though she's a doctor, Hemmer noted to Stavas that she's not actually trained for this sort of situation. Stavas pointed to her instincts and prior experience as a nurse.

"Whatever it was, it kicked in and I knew I had to do something," she said.

Stavas believes a similar attack could happen again, but added that the city of Boston and the world realized after the bombing that "we cannot live in fear."

Today, Stavas is running in her 11th Boston Marathon alongside her father.

"For me, closure for what happened last year is still 26.2 miles away."

Watch the full interview above.

More on the 2014 Boston Marathon and memorial from Fox News:

Boston Set For First Marathon Since Bombing

Boston Strong: Team MR8 to Run in Honor of 8-Year-Old Bombing Victim

'You're the Face of America's Resolve': Biden Speaks at Boston Bombing Memorial