Which one of you shows as the Primary account holder? If it is you, all you need to do is sign into the account as the primary, then click on "My account" at the top of the landing page. Once there, click on "Users". You should see both accounts listed. Then click on "Edit" to the right of his account and you will see the option to suspend or delete it.
If your husband was the Primary account holder, you will need to change your account over to be primary. Then his becomes a secondary and you can delete it as I described above. To do that-------------