Too many to list but here are the last couple of big ones that made national news

Per ChatGPT

Notable U.S. School Shootings and Sentences since 2018

Parkland (Marjory Stoneman Douglas High School, 2018) – Nikolas Cruz

Sentence: Life in prison without parole.

Santa Fe High School (2018) – Dimitrios Pagourtzis

Outcome: Deemed incompetent to stand trial; remains in psychiatric custody.

Saugus High School (2019) – Nathaniel Berhow

Outcome: Committed suicide at the scene.

Oxford High School (2021) – Ethan Crumbley

Sentence: Life in prison without parole. His parents are also facing criminal charges for involuntary manslaughter.

Robb Elementary School (Uvalde, 2022) – Salvador Ramos

Outcome: Killed by law enforcement.