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The groggy Mr.

Aust went back to sleep.

When he got up about 7 to prepare for class, Mr.

Cho was gone.

• Emily Hilscher, a freshman, lived in Room 4040, near the elevators on the fourth floor of West Ambler Johnston Hall, one building from Harper.

Shortly after 7 a.m., she was killed by bullets from Mr.

Cho’s gun.

The same fate met Ryan Clark, one of the dorm’s resident advisers.

Mr.

Clark is believed to have come out of his room to investigate the noise, only to stumble into death.

Officials say they know of no connection between Mr.

Cho and Ms.

Hilscher, and remain baffled about why he began there and why he chose not to end there.

“The biggest thing for us is Location One,” a law enforcement official said.

“Why Location One?

Why did he stop at two killings there?

” The campus police received a 911 call at 7:15, when the rest of the campus was still opening its eyes, the thousands of students who commuted to school not yet on the grounds.

Classes had not begun, and the campus was not alerted to the dormitory killings.

The university police quickly picked up some information, and the nature of it led them to make a decision and follow a trail.

Ms.

Hilscher’s roommate, Heather Haughn, had shown up at 7:30 to meet her and accompany her to class.

Instead, she encountered the campus police.

One of the things she told them was that Ms.

Hilscher had a boyfriend, Karl D.

Thornhill, a senior ...

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