The latest wacko white dude to go nuts with a gun, John Russell Houser, had a long history of what is euphemistically called "mental problems." Therefore you can bet your bottom dollar he had an equally long history of being prescribed anti-depressants.
We've all seen the advertisements for this stuff... most of the ad is taken up by the warnings, which invariably warn of potential side effects that include wanting to harm yourself and others. If you are on one of these wonder drugs, and you get the urge to wreak havoc and harm yourself and/or others, you should consult your doctor right away.
There is by now a fairly substantial body of literature linking mass shootings to anti-depressant wonder-drugs. Looks like a few of these wretches get to the local gun store before getting around to consulting their doctor.
And after each new act in this tiresome play, America once again has another discussion about racism or terrorism or guns, but NEVER does America have a discussion about those prescription drugs.