Several items belonging to Hribal were seized from his home , including a notebook with writing in it and a knife holder assumed to have held the two knives used in the attack . A cellphone was also seized from Hribal 's school locker , as was a note dated April 6 , which read , " I ca n't wait to see the priceless and helpless looks on the faces of the students of one of the ' best schools in Pennsylvania ' realize their precious lives are going to be taken by the only one among them that is n't a plebian . " On June 10 , 2014 , a warrant was unsealed which stated that Hribal had written a document about the Norse legend Ragnarök , as well as his dissatisfaction with society . The warrant also stated that two students had received threatening phone calls on the day before the stabbing , which were suspected to have been from Hribal . On September 26 , 2014 , psychologist Bruce Chambers testified that Hribal was inspired by the 1999 Columbine High School massacre , that he identified with the perpetrators Eric Harris and Dylan Klebold , and that he had originally planned to carry out the stabbing on April 20 , the fifteenth anniversary of Columbine , but changed the date to April 9 , the birthday of Eric Harris , because April 20 fell on a Sunday that year
Columbine High School massacre
Columbine High School massacre
Franklin Regional High School stabbing