Start with high-confidence death & dying for teens books, then narrow by subgenre or adjacent topics.
Grief Girl
Erin Vincent
Dying
Pat McNees
Dancing at the Pity Party
Tyler Feder
Looking Back
Lois Lowry
Grieving With Hope
Samuel J.I.V. Hodges, Kathy Leonard
Pedro and Me
Judd Winick
Grieving a Suicide
Albert Y. Hsu
The Fall of Freddie the Leaf
Leo Buscaglia
Good Grief
Granger E. Westberg
The Other Side of Sadness
George A. Bonanno
It's OK That You're Not OK
Megan Devine LPC, Mark Nepo
When a Friend Dies
Marilyn E. Gootman
What to Do When I'm Gone
Suzy Hopkins
Grief Day by Day
Jan Warner, Amanda Bearse
When We See You Again
Rachel Goldberg-Polin
Lightkeeper
Stacy Waldman Bass