You will get it back near the end of the main questline.
A monk has one in the place where you first give the amulet of the Kings.
Kings of Oblivion was created in 1973.
His body stays their until one of two things happen. 1. you give the amulet of kings to jauffre 2. you get to the Brotherhood quest where you travel back through the sewers to kill Valen Dreath
Just talk to him and he will take it from you
Right at the end once you've gone through Mankar Camorans paradise and retrieved the Amulet of Kings. Mehrunes Dagon will attack the Imperial City. Wabajack can destroy him instantly for soem reason...
Note: This answer relates to the Shivering Isles add on for Oblivion. The "Amulet of Disintegration" is located in the Northwest area of Mania in the ruins of Milchar. Once you get to Milchar you need to work your way to the third zone which is Milchar, Chatterhall. Once there you need to find the room with the three torches. Once all of them are lit you will be able to open the Diligence Crux in the middle of the room. The urn holds the "Amulet of Disintegration"
if your killing him for the money may i recomend the kings and queens
Contemplations
Superboy - 1988 Back to Oblivion 1-3 was released on: USA: 22 October 1988
Get enough money to buy it back
Brother Jauffre is a monk who lives at Weynon Priory.He is also a member of the emperor's bodyguard faction called The Blades and is the only person who knows the location of the emperor's secret heir.The player needs to take the magical Amulet of Kings to Brother Jauffre at the start of the game as part of the main questline.
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