Casting for True Detective's second season on HBO has yet to be confirmed, but some sources are now suggesting that casting is not only completed, but production has already begun.

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On Monday True Detective Rumors noted that while recent rumors about casting are beginning to be taken as fact, they still remain rumors. Likely frontrunners seem to be Colin Farrell (Minority Report, Saving Mr. Banks), Vince Vaughn (Wedding Crashers, Into the Wild), Taylor Kitsch (Friday Night Lights) and Elisabeth Moss (Mad Men). Nonetheless, nothing is set in stone.

One theory posed by True Detective Rumors writer Josh Hill is that casting for the show has been completed, just not announced. Furthermore, Hill has suggested that production could very well have been started in secret for the drama's highly anticipated second season.

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Series creator and writer Nic Pizzolatto has remained pretty tight-lipped when it comes to casting and the scripts for Season 2, though he has confirmed that the new episodes will take place in California with one to three leading characters.

Fans of the crime drama are still reeling from the show's devastating loss at the Emmys last week, where the series lost out in all the major acting and writing categories. True Detective Rumors stated on Tuesday that the program could have had more luck if submitted as a miniseries, which is something the network may keep in mind when it comes to future seasons.

True Detective returns to HBO for a second season in 2015.