Question about Sql Accounts and Deletion Management

Question about Sql users.  I have a sql user that is added in the security section of the actual database.  I have the same user located in the instance level of security.  I deleted the user at the instance level but the user remained at the database level.  What is the proper way to delete a user if I totally want to rid the instance and all databases of this user login.

Also, all of the users in question should not be a owner of the database.

Question.... is there any danger in data being inaccessible after deletion of these users.

also, if i happen to delete a database owner..... i can always reassign that role to another user from an SA login.... Please verify.
jamesmetcalf74Asked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
I have a sql user that is added in the security section of the actual database.  I have the same user located in the instance level of security.  I deleted the user at the instance level but the user remained at the database level.  
That's because the first is a SQL Login and the second a Database User.

What is the proper way to delete a user if I totally want to rid the instance and all databases of this user login.
Proper way is to delete both (Login and database user).
DROP LOGIN <loginName>
GO
USE databaseName
DROP USER <userName>

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Question.... is there any danger in data being inaccessible after deletion of these users.
For user that user won't be able to access the data anymore but others users still can. Just be sure you let at least one login with sysadmin server role to fix the things if needed.

also, if i happen to delete a database owner..... i can always reassign that role to another user from an SA login
True. For that run the following:
USE DatabaseName
EXEC sp_changedbowner 'UserName'

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