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As usual, Cho doesn't say a word.Aust said Cho recently began getting up at about 5:30 a.m., popped prescription pills every day.

Recently, he went to the campus gym at night to lift weights.

He cut his hair into a military-style buzz.Aust said Cho may have had an imaginary girlfriend, a supermodel named "Jelly."7:15 a.m.: Virginia Tech police receive a 911 call about shots fired at West Ambler dormitory.

Investigators discover the bodies of a male and female student.

They believe it's a domestic dispute gone bad.9:01 a.m.: Cho mails his package to NBC, received at a Virginia post office about an hour and 45 minutes after dorm shootings."He had the wrong address and ZIP code," said Steve Capus, NBC News president.Police believe he also returned to his dorm to reload his guns.

9:15 a.m.: While interviewing a "person of interest" about the double murders, police are alerted to shots fired at Norris Hall engineering building.9:45 a.m.: Police arrive to find the front doors chained from inside.

As investigators ram open doors, shots are being fired on the second floor.

Bodies are found scattered in four rooms and the stairwell.

Cho has killed himself.

A 9-mm Glock and new Walther P22 are found near his body.

The serial numbers had been filed off.

One was used in the earlier shootings.Witnesses say he calmly shot point-blank at students and professors, firing through doors at others who tried to barricade ...

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