Hi, welcome and thank you for your question. My name is ***** ***** I am glad to assist you today.
I am very sorry to hear about your loss. My condolences.
Regarding your request, I believe you need to do it yourself or with the help of family members since Facebook needs information that only you or your family member can provide. The process is called by Facebook as "Memorialization".
So all you need to do is fill out the needed information in the Memorialization page, submit a proof of death as Facebook calls it, then your husband's account will be removed or deactivated.
Now, to file that Memorialization form, please click on this link:
To know more about what happens when an account is memorialized, here is the link:
<What Happens to Memorialized Accounts>
I hope that helped.
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