Whilst not a teacher, in primary school (or whatever the American equivalent is) there was a girl in my class who had cancer. We would have been about 7/8 years old at the time? All I really remember is that she lost her hair and ended up having to use a wheelchair, obviously from the treatment.
They put up a memorial thing on the grassy bit next to the school building. About a 2 years ago I noticed they replaced it with a trash can...I mean, yea, it was like almost 15 years ago and probably nobody in the school now knew her (I would be surprised if any of those teachers are still alive...They were living on borrowed time back then, let alone now), but c'mon, if you're gonna get rid of a memorial for a dead kid, don't replace it with a trash can...