By Paul Kurtz

PHILADELPHIA (CBS) — A new exhibit at the National Constitution Center features a gallery of Pulitzer prize-winning photographs.

One of the featured photos is by a local man who was there for today’s ribbon-cutting.

Tom Kelly calls it “the picture that defines me.”

Kelly was working for the Pottstown Mercury when he snapped a series of photos for the newspaper depicting a bearded, bloody, bare-chested man running from police after killing some of his family members.

The stunning images won the 1979 Pulitzer Prize.

Kelly says the shot featured in the new exhibit was the product of instinct and reaction.

“He was about three or four feet in front of me, running at me, police chasing him,” Kelly recalls.  “I didn’t see him because I was putting one camera on my shoulder, and with my thumb I took a picture — just a reaction, a quick reaction, so quick that I didn’t see it — with the camera that was hanging around my neck.”

And now it stands among such iconic images as the US Marines raising the American flag on Iwo Jima and Jack Ruby’s assassination of Lee Harvey Oswald.

More than 150 photographs will be on display at the Constitution Center through the end of the year.

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