COLUMBINE by Jeff Klass
It was different than the one by Cullen because Klass got more info on the parents. The most interesting discovering IMHO was Susan Klebold's depression and and racing brain documented while she was a student at Ohio State. Perhaps bipolar? Dylan was bipolar and obessed with suicide but the parents didn't know and thus didn't get him the help he needed. She has stated this is her biggest regret in life.
Also, it has more info about the Columbine "area" which was my home for 30 years. Kass knows the area and was a reporter for the Rocky Mountain News...may it RIP.
I liked the Cullen book better because there was more info and documentation about what CAUSED Columbine.
"resident shameless hussie"