Are you able to see Gary's record on FamilySearch? If so, you should be able to add the date of his death.
If the death hasn't been put on the record (and so Gary is still listed as living), the record would be confidential. If that's the case, contact FamilySearch support and they should be able to get the problem worked out.
Here is the correct ID number: Gary Egbert
15 July 1935 – 12 February 2020
Your question will be forwarded to a specialty team for review and resolution. You may be contacted by that team if they need to gather more information.