Steve Parker, senior game producer of Diablo 3, announced on Twitter last Friday that he is no longer working for Blizzard.
"Hey Twitter, I'm no longer working at Blizzard or on D3," he wrote.
"I've had a great 5 years there and those guys are going to kill it with Diablo."
No further details were given on the reasons for his departure.
The announcement was made on the same day that game director Jay Wilson outlined key revisions being made to Diablo 3, while reassuring fans that the continued development time would make the game worth the extra wait.
"We want Diablo 3 to be the best game it can be when it launches," he wrote.
"To get there, we're going to be iterating on designs we've had in place for a long time, making changes to systems you've spent a lot of time theorycrafting, and removing features you may have come to associate with the core of the experience.
"Our hope is that by embracing our iterative design process in which we question ourselves and our decisions, Diablo 3 won't just live up to our expectations, but will continue to do so a decade after it's released."
Diablo 3 was originally announced way back in 2008. It's still - hopefully - due for release in 2012.