Level 80 character deleted in icecrown realm

Hello, I’m creating this post because I haven’t logged into the server in a while, and when I logged in, I noticed that my only character, a level 80 DK on the Icecrown realm, has been deleted. I don’t understand why. I leveled this DK a long time ago on the Frostwolf realm, and it was later transferred to the Icecrown realm. To be honest, I don’t remember the character's name, I only remember it was a level 80 human death knight. I would appreciate it if you could help me.

1. https://www.warmane.com/account/barracks
2. Is it possible you logged wrong account?
3. Deleted by another player, maybe someone you know or shared account details with.

Since it may have been deleted long time ago, character restoration is most likely not possible anymore.
https://www.warmane.com/account/history may shed some light.