I really am surprised, DR Jennifer, that you did not know that on the 100th episode (this week's installment) one of the people closest to Clark (i.e. someone from the opening credits) was going to die. It's been in newspaper reports literally for months so how you could have escaped noticing or hearing about it (not who but just that something tragic was going to happen) simply astonishes me. I revealed nothing about the identity of the person and don't think a spoiler was necessary with all of the publicity this episode had generated LONG before it aired.
And even with the death, there is a serious twist NO ONE could have predicted was coming. So I spoiled nothing really, at least in my estimation.