Disconnected participants

The account will still exist but if you were authenticating to AD, they account will no longer be able to be logged into. If AD is your LDAP and not using OpenDJ or WindchillDS, the account will be a disconnected user. Account will still need to be deleted on the Windchill side or moved into a group that is denied all access. You should also remove all licenses from the user so they can be reallocated. 

I'd also recommend checking for any items Checked Out to the employee, as well as any Tasks that are not completed.

Data Monitors can be helpful for this, if you're able to set up Query Builder reports for these.

Hello @WH_4556804, 

It looks like you have some responses from some community experts. If any of these replies helped you solve your question please mark the appropriate reply as the Accepted Solution. 
Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.

Thanks,
Vivek N.
Community Moderation Team.