Shane Caporaso was working at a hotel construction site Tuesday morning when he came face to face with a gunman who had already shot and killed three people in a series of crimes that stretched from Ladera Ranch to the Tustin area.

Caporaso, the plumbing project foreman at the site, was is his truck when he received a call that a co-worker had been shot near Edinger Avenue and the 55 Freeway, just across the street from the work site. He ran toward the location, where he saw his co-worker on the ground and Ali Syed holding a gun.

"I heard him chamber a round in the shotgun," Caporaso said. "I knew I had X amount of time to run.

"I kind of knew he was going to shoot me. I just started running and got lucky."

Read more at NBC News