If you want to mark a Seller Lead as "Dead" for it to be deleted you will have to change the Motivation to “For Deletion”.
All of the leads marked for deletion are gathered in a separate For Deletion view.
In order to delete them go an click the view. Then select all the items in that view.
Then click the delete button from the right side of the screen, type "delete these items" and click the green button "Delete these items."
Note: Items can be deleted only by the users that have an admin role in that workspace. A common practice and what we recommend is to keep the unwanted seller leads in the system and just categorize them by changing their Motivation to "For Deletion".
Please contact REIvolution support should you require assistance.