Update -- the following is reported by the student paper:
"I want to assure you that the person who committed the acts on Saturday night/Sunday morning was not a brother in our chapter. He is a Sigma Pi visiting from another university,"
For the article where it appears, see
http://www.cornellsun.com/section/ne...nity-says-stat
Reportedly there's some question about how many people on the roof were involved in the alleged actions; see
http://www.cornellsun.com/section/ne...pi-controversy
Comment: If this "visiting" person is in fact a Sigma Pi from another chapter, and if he in fact was the perpetrator of the alleged activities, I wonder what his chapter (and Sigma Pi HQ) will do? Time will tell, I guess.
How do you solve a problem like whatever-his-name-is . . .