wisn's colleen henry reports from marinette, wisconsin. >> i never would have thought that he would doething like that. maybe right out of a book or something. but i don't know. >> reporter: kelsey leisner rode the bus to school with sam hangle on tuesday morning. she has known him since preschool. the hengels blocked a their driveway with a no trespassing sign. but they released a statement. unfortunately, we may never know the answer to the question why, because there were no indicators to make us think that something is wrong. even though we are devastated and heartbroken over the loss of our son, we're extremely thankful there were no other injuries in this incident. as investigators work to unravel a motive, the kids who were in the classroom, worked through with counselors. >> i'm sure he snapped. but everybody wants to snap. he didn't hurt anybody. you can tell that. he's all crazy. he wanted attention. wanted to talk. something. more than likely, just wanted to talk. >> reporter: karen leisner said that sam was a quiet kid, who must have kept his torment to himself. >> i can't

wisn's colleen henry reports now from marinette, wisconsin. >> i never would have thought that he would maybe wrote it out of a book or something. but i don't know. >> reporter: kelsey rode the bus to school with sam monday morning. she's known him since preschool. their families live two doors apart. the hengels blocked their driveway with a no trespassing sign. but the family released a written statement, revealing its own bewilderment. "unfortunately, we may never know the answer to the question why. because there were no indicators to make us think something was wrong. even though we are devastated and heartbroken over the loss of our son, we are extremely thankful there were no other injuries in this incident." as investigators work to unravel a motive, the kids who were in the classroom with sam work through with counselors. >> i'm sure he snapped but everyone wants to snap. he didn't hurt anybody. you could tell that. it's not like he's all crazy. i don't know, he wanted attention, wanted to talk, something. more than likely, he just wanted to talk. >> reporter: karen says sam wa