In the present, Klaue allied himself with Erik “Killmonger” Stevens, but it was revealed that he was just a means to an end, and Killmonger killed him and brought his body back to Wakanda so he could gain an audience with T’Challa.
It was revealed that Klaue had snuck into Wakanda nearly 30 years ago to steal vibranium, which resulted in numerous citizens of the technologically advanced African nation being killed.
Ulysses Klaue resurfaced in Black Panther with a prosthetic arm that contained a sonic disruptor cannon made from Wakandan mining equipment, a callback to the weapon he’s outfitted with in the comics.
In the comics, Klaw (as it’s spelled there) became a being of solidified sound and continues to be an antagonist in that universe, but as far as the MCU is concerned, his story is done.