If you do not live in a community property state is a wife responsible for the credit card debt of her deceased spouse when the account was in his name only?

No. The credit card debt will become a part of the probate procedure and will be handled according to the distribution laws of the state in which the person resided at the time of his or her death. Please be advised, it is not unusual for a creditor/collector to attempt to convince a surviving spouse that they are responsible for the debt especially if said spouse was an authorized user of the account. Be that as it may, the surviving spouse or other family members are not responsible for the debts of the deceased unless they were a joint account holder.