. >> brent doonan, a 25-year-old office manager at all-tech investments, gave this interview from his hospital bed while recovering from five gunshot wounds. >> and mark had came past the conference room. you know, he came back once and he said, come here, come here. i said, "hold on a minute. hold on a minute." and he gave me that smile like he always does. "come here." >> doonan along with two other employees follows mark barton, a man he knows and trusts, a fellow day trader and friend, into an office next to the conference room. >> having gotten all three people in that one office, barton closed the door and closed the venetian blinds so that no one could see into the glass on the front of the office. >> and he said -- he said today is going to be a visual. i just kind of looked and he pulls out these two guns and still, even at this point, i thought they were some sort of cap guns or something, and the next thing i know he points them at me and he starts shooting. >> meanwhile, 16 miles south of atlanta in stockbridge, georgia, a shocking multiple murder investigation is under wa