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HOUSTON As investigators continue to break down what happened Monday when a gunman went on a rampage that left three people dead, we have new insight from a person who witnessed it all.

The shootout started when a Brazos County constable served an eviction notice to 35-year-old Thomas Caffall at a home at the corner of Fidelity and Highland, near the Texas A&M campus.

When Constable Brian Bachmann, 41, served the notice, police said Caffall started shooting. Bachmann was hit and died at the scene.

I hear these five shots and they were loud. I knew right away it wasn t a fire cracker, said Jeff Mann, a witness. And it was just a terrible sight. I saw the officer on his back and I knew right away.

I pulled out my cell phone and called 911, and as I was waiting for 911 to answer, the shooter looked right up at me and we locked eyes, he said. So I m running over here as fast as I can to get behind something, because I was afraid I was going to be shot. I was the first person the shooter saw after he just murdered a police officer.

After that, other officers arrived and exchanged gunfire with Caffall, investigators said.Caffall was fatally struck.

Not far away, neighbor Rigo Sisneros caught it all on his cell-phone camera. The former Army medic helped try to revive the constable and then aided Caffal. He said one of Caffall's last statements was please tell the officer I shot I m sorry.

Sisneros, an 18-year-military veteran, said he s never witnessed the kind of professionalism he saw among first responders on Monday.He declined an on-camera interview out of respect for the fallen officer.

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