How can I check which user deleted other users

You have a similar issue before about node deletion and what I posted is to use the Auditing Events.  I think you opted to use a custom Query.  Instead of relying on custom queries, familiarize yourself with the default features of the product.

solarwindscore.my.site.com/.../Viewing-and-reporting-audit-events

Thanks for the reminder, I was able to find details in the Message center.

Good call, donrobert5. The report is great, especially if you need to generate a report on a schedule for compliance or internal due diligence. However, I still default to the Message Center if I need to take a quick look to see who did what. With all the developments we've done in the Platform in recent years, the Message Center is still my "go-to" for looking through audit events, and one of the biggest reasons I still advise customers to give everyone a unique logon (don't all use Admin!) You'd be surprised how many people still just pass around the admin login. *facepalm* Don't do that. For a dozen different reasons.... don't do that! LOL

Good call, donrobert5. The report is great, especially if you need to generate a report on a schedule for compliance or internal due diligence. However, I still default to the Message Center if I need to take a quick look to see who did what. With all the developments we've done in the Platform in recent years, the Message Center is still my "go-to" for looking through audit events, and one of the biggest reasons I still advise customers to give everyone a unique logon (don't all use Admin!) You'd be surprised how many people still just pass around the admin login. *facepalm* Don't do that. For a dozen different reasons.... don't do that! LOL