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Yup:
https://paleofam.com/2018/11/list-of-mass-shooters-on-antidepressants/
Archive for above: https://archive.ph/ISM1G

https://www.midwesterndoctor.com/p/the-decades-of-evidence-that-antidepressants

https://theworldwatch.com/videos/1630431/every-single-one/

https://www.naturalnews.com/2018-02-16-psych-drug-shooters-florida-school-shooter-was-on-medication-reports-miami-herald-just-like-nearly-all-the-others.html

https://www.theburningplatform.com/2022/07/05/37-school-shooters-school-related-violence-committed-by-those-under-the-influence-of-psychiatric-drugs/




Nope, it's a myth and even when the shooter is on something, you can't prove it:
https://pubmed.ncbi.nlm.nih.gov/31513302/