One question for authorities

Doubtless, the authorities are working diligently to get to the bottom of yesterday's gruesome rampage at Virginia Tech. There's not a person in this nation who would trade places with Tech administrators, police or other law enforcement authorities investigating what led Cho Seung-Hui to masacre 32 people. But one question begs to be answered: Where was the 23-year-old gunman between 7:15, when he apparently killed two people in a residence hall, and 9:45, when the slaughter of 30 people turned this into the worst mass murder in U.S. history?