"A 26-year-old Canadian found dead in his Thai police cell this week was wanted in the US for allegedly running a massive 'dark web' marketplace"

Yahoo:

Speculation is rife that the underground marketplace was AlphaBay, considered the world's largest and most lucrative darknet bazaar until it was taken down within hours of Cazes' arrest.

...

It was "more than twice as big as Silk Road was in its heyday, with a revenue of somewhere between 600,000 and 800,000 dollars a day in early 2017, and that's a rather conservative estimate," he told AFP.

...

Cazes appeared to be living a life of luxury in Thailand, where he owned three houses and four cars