This depends on whether you have the permission of the Assignee
Issue Permissions
Explanation
Assign Issues
Permission to assign issues to users. (See also Assignable User permission below)
https://confluence.atlassian.com/display/JIRA051/__project+permissions
It's better to deactivate the user than deleting.https://confluence.atlassian.com/display/JIRA/Managing+Users#ManagingUsers-Deactivatingauser
Thanks Ollie. How about the tasks which he worked on. Can I unassign the tasks which are in progress.
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