A former co-worker of mine passed away 8 or 9 years ago, and every year I get a LinkedIn notification asking me to congratulate them on their upcoming work anniversary. It's terrible.
Same thing was happening to me - LinkedIn has a solid deceased policy. I submitted a request with a link to a public obituary, and less than 24hrs later their page was gone. Bittersweet, I’ll miss seeing them pop up now and then, but also won’t feel like they are being disrespected by inaccurate online updates and notifications.