While the title of "king of yorker" is subjective and can vary depending on the era and context, Lasith Malinga and Jasprit Bumrah are widely considered prime contenders for the title.
Lasith Malinga is often credited as the original "yorker king" for his consistent ability to deliver pinpoint yorkers, especially his signature slow yorker, which revolutionized death bowling. He was a mainstay for the Mumbai Indians in the IPL and his yorkers were instrumental in their success.
In more recent times, Jasprit Bumrah has emerged as a leading exponent of the yorker. His ability to bowl accurate and lethal yorkers at high pace makes him a feared bowler at the death. His skill has earned him comparisons to Malinga and the moniker of "yorker king" within the current generation.
Therefore, while Malinga might be seen as the originator and legend, Bumrah is arguably the current king of the yorker due to his contemporary dominance with this particular skill.