Widowed BIL cashed in wife’s 401k, is his SSD in danger?

He is on Social Security Disability. He depended solely on his wife for taking care of bills, house, etc. If he’d been diagnosed 50 years ago, he would have been in a special ed classroom. He lives in Michigan. He had very little in savings and needed some major repairs done on his house, so he cashed out his deceased wife’s 401k to the tune of $110k. After taxes, he netted about 70k (ouch, what a tax hit!!). He did this without discussing it with anyone (my husband and other BIL) are keeping on eye on him long distance. The question is—is his SSD in danger since he cashed in the account? He’s barely scraping by and gets a wee bit of financial help from their very aged parents. 70k sounds like a lot of money, but he could have 20+ years of life ahead and he’s not financially savvy.