It looks like Unn indeed died in their town.
From what I can see in the logs.
Unn disconnected around 13:28:34, then logged in about 7 minutes later at a height of y = 91 at 13:35:43.
Then I see the death event from the tool 3 seconds after login at y=63 at time 13:35:46, which is the same level is right on top of the stone_slab layer in said town. I tested a fall from 91 to 63 myself, it takes me about 1.6 seconds to fall 28 blocks.
What it looks like they fell from y = 91 and died at y = 63, which is a 28 block fall and would kill a player without feather falling boots.
No logblock in the area to indicated any previously existing builds that may have been destroyed to cause a fall or any block changes that might point to a player-caused death.
Logging in/out at y=91 would be indicative that the user had /fly enabled, looks like it may have been an issue with /fly not re-enabling upon login. But I'm not 100% sure. Another possible explanation is someone logged the player in and disabled /fly themselves via space-bar while Unn was away from the computer.

@andrewkm

 

@andrewkm

Unn states they were able to make it back to their death spot and retrieve the tools.
Logs also confirm the tool with the ID presented here was picked up and re-owned by them.