The Dead Courier is an Argonian rogue who was delivering a Weathered Letter as part of the ongoing correspondence between various members of the Malifant clan. Unfortunately, he met his fate among the traps and guardians of Ebrocca.
He always carries the letter, a few coins, and a leveled, one-handed weapon, and has a chance of having other equipment too. Half the time he will have a random amulet or necklace, and there's one chance in four of having each of a leveled pair of boots, greaves, ring and gem. 10% of the time he will also have a silver nugget.