Yep, 30 years ago.
Hollowfox, Have to correct you on the gymnasium thing. The tent city protests were broken up by the police, the gym was built pretty much without modification, exactly as planned. Truth is that it was never planned to be built on the actual sites from which the guardsman shot or the students fell. You can still walk unencumbered across commons from where the burned ROTC building was and where the National Guard made their camp, to the bell where the students buried the Constitution in protest, up the hill past Taylor Hall to the Pagoda. You can still stand where the guardsman stood with a clear view of their field of fire, and put your finger into the hole an M1 round made in a half inch iron plate from an abstract sculpture. You can stand on every site where a student died.
There's even a memorial of sorts now, although I found it singularly lacking in effect when I finally saw it. I would have preferred the originally commissioned Segal sculpture that the University rejected after he showed them what he'd made. The Trustees wanted something emotionally neutral to help foster a sense of reconcilliation and healing. Somehow they felt a statue of Abraham sacrificing Issac fell a litte far of that mark. Most of the wounded students and the family members of those slain disagreed, and felt it sounded just the right tone.