. >> detectives quickly learned that the apartment belongs to leigh ann barton, the wife of mark barton. what they don't know yet is that he is now waging war on the financial center of atlanta. >> i left the apartment to obtain the search warrant and then when we re-entered the apartment over to our left was like a table and it had a computer on the table and there was a note on the computer which we did not see at original entry and there was a letter from mark o. barton. >> in the letter barton wrote, "to whom it may concern, leigh ann is in the master bedroom closet under a blanket. i killed her on tuesday night. i killed matthew and michelle wednesday night." back in atlanta at all-tech investments, mark barton continues his rampage. he opens fire on the office manager brent doonan and two other all-tech employees, whom he's lured into a nearby office. nell jones is at her desk. >> and i was just sitting looking at my computer screen and i heard what i thought was about five loud noises, bangs, pops. >> the blood was starting to go everywhere. i was scared to death. i was scared to

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