Sounds like it was just looted.

No since i was right next to him when he died. And he did not log out. He was waiting for me to secure his things. But i could not since there was nothing on him. All wiped in the backpack and clothes.

there is an already reported bug where the items are not accessible and invisible. you can fix that by relogging or if you force the server to update the content for you. That is, put an item in it (by dragging it on the text/main bar instead on an actual grid).