Deleting a TFS Task

If you need to delete a TFS task, run this command,
witadmin.exe destroywi /Collection:<TFS url> /id:<Task id>
where TFS url == Team Project Collection URL  &
Task id == Task ID that is assigned by TFS
In this case, I am deleting a task with ID 31 where URL of project collection is “http:\\test-tfs-srv01:8080\tfs\DefaultCollection”