who died...? (spoilers??)

In a scene near the end of the movie, the "girl group" is screaming at the group of guys who raped Kuno, and one of them laughed about something and another girl said "How can you be laughing when someone has just died!?"
Who was it that died?
Did Shiori Tsuda commit suicide? (Because in on scene, her keys and such were hanging off of a telephone wire and she was on the ground...)