Terminate / Termination
In the context of terminating a person, this is usually used to describe end of job roles, amongst other things e.g. Date of Termination
Why it matters
The word has a link to the ending of life, whether relating to pregnancy, euthanasia, manslaughter or murder. Specifically this can conjure unwarranted and upsetting imagery or may be triggering.
Instead try saying:
End of role / term / contract
Left the role / department / company
Further External Reading Link