To delete a stack
From the list of stacks in the AWS CloudFormation console, select the stack that you want to delete (it must be currently running).
Click Delete Stack.
Click Yes, Delete when prompted.
After stack deletion has begun, you cannot abort it. The stack proceeds to the DELETE_IN_PROGRESS state.
After the stack deletion is complete, the stack will be in the DELETE_COMPLETE state. Stacks in the DELETE_COMPLETE state are not displayed in the AWS CloudFormation console by default. To display deleted stacks, you must change the stack view setting as described in Viewing Deleted Stacks.