According to reporters tweeting from the event, there is no director attached yet, but five episodes have been written and the "Moonlight" star will take on a lead role.
The Tracking Board's Jeff Sneider broke the news at the end of June that the 2017 Best Supporting Actor Oscar winner was in negotiations to join the anthology series.
Expect more big names to follow. Season 1 kicked off the critically acclaimed series with Matthew McConaughey and Woody Harrelson as the detectives investigating a chilling murder. Season 2 was packed with more big names: Vince Vaughn, Colin Farrell, Rachel McAdams and Taylor Kitsch.
Unfortunately, lightning did not strike twice for creator Nic Pizzolatto, as Season 2 was slammed by both critics and viewers. But with such a strong Season 1, it's hard to write off the show, especially now that Ali is involved. The actor has become one of the most in-demand talents in Hollywood after captivating viewers in "House of Cards," "Luke Cage" and "Moonlight," the latter of which didn't give him much screen time, but it was enough to beat out Jeff Bridges, Dev Patel and Michael Shannon for the Academy Award.
Here's some of the chatter coming out of TCA.
HBO Prez confirms they have a deal with Mahershala Ali to star in S3 of True Detective. Looking for a director. He's read 5 scripts. #TCA17— Sandra Gonzalez (@TheSandraG) July 26, 2017