Someone in the Favorite Artists/Bands Of School Shooters thread requested this so here we go:
Eric Harris and Dylan Klebold (most obvious)
Kimveer Gill
Jesse Osborne
Alexandre Bissonette
Anton Bichivin
Anton Lundin Pettersson
Pekka-Eric Auvinen
Matti Saari
Hayden Jagst
William Atchison
Robert Bonelli Jr.
Matthew Murray
Vladislav Roslyakov
Dimitrios Pagourtzis (presumably)
James Gamble (foiled)
Karl Pierson
Geddy Kramer (iirc)
Sebastian Bosse
These are the ones I can think of at the top of my head
_________________
"I'll never understand humans. The way they live their lives, their feelings, the things they want to do in life, probably has something to do with these
invisible gods they pray to. Meh" - Kimveer Gill
"Humanity is overrated, isn't it?" - Matti Saari
"Live in virtue, no desire
And in the grave an angel's choir
You look to heaven and wonder why
No one can see them in the sky
Just as the clouds have gone to sleep
Angels can be seen in heaven's keep
Alone in fear, they question why
Goddamn, not an angel when I die" - Engel, Rammstein (English version)