Sorry to hear. Yer, tough gig that one. Had a few of those from suicide and such, spouses notifying us. I have placed accounts into a high privacy state, basically, and at times members have started a thread to acknowledge the passing...
Over the years we've lost quite a few users.
We have a "Deceased" User Group with a user banner.
We also have an "In memoriam" forum where "RIP" threads go after they've been in our community chat forum for a while.
The community has also donated money towards planting a grove of trees in memory of the users.