As a general guideline, where an author made a substantial contribution to a Cochrane Review or protocol for a Cochrane Review (sufficient to warrant authorship) but died before publication, and the co-authors feel it is appropriate to include the deceased author on the byline, then editorial teams could permit inclusion of the author on the byline until the review is updated.
...
Contact details: Modify contact details so that the published protocol or review will note that the author is deceased and include the name, institution and country, that were correct before they died. An email address is required. Please see See Deceased contributors for guidance details on how this field should be completed. Delete the rest of their contact details, and put "Deceased" in the footnote field of the author contact details in the review. This is a review-level annotation. If the author in question is included on the byline of more than one review, the same footnote should be included in each of the reviews they authored.
...