If it was a traditional retirement account then none of the money that was deposited into it was taxed before it went in. It was all tax free. So, unfortunately, you can't take a tax deduction for losses within a tax free account.
If it was a ROTH retirement account and the money deposited was taxed prior to being deposited then the loss would be written off on schedule D as a sale of an investment sold for zero dollars and costing all of the deposits that your husband made into the account.
@lisacatania
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