Replace "<your_db_name>" with the restored db name:
ALTER AUTHORIZATION ON DATABASE::<your_db_name> TO sa
USE <your_db_name>
DROP USER <user_name>
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".