The next episode of True Detective will feature Hart (Woody Harrelson) continuing to self-destruct as the Dora Lange murder case unravels.

Cohle & Hart "Make the Mistake" of Underestimating Maggie in Final Episodes?

Episode 7 of True Detective is the last episode before the finale, and it features the reunion of Hart and Cohle (Matthew McConaughey). The detectives are seen in the promo for the episode coming together again to reinvestigate the the case.

The promo features Cohle telling Hart, "We left something undone. We gotta fix it." Cohle and Hart speak to various locals about the case, who reply with abstract sayings about death and dreams. The promo concludes with Cohle showing Hart something devastating as Hart reacts very emotionally.

Cohle & Hart Driven Insane?

Episode 7 will be a critical one, and while the Dora Lange murder case will not be solved just yet, the ending is something that should not be missed, according to E! Online. The report even quips that "you may or may not have a full-on heart attack" based on the ending.

The report also confirms that Hart will continue his self-destructive tendencies.

Fans have been speculating online about the identity of the Yellow King, and Yahoo recently published an article suggesting that it could be Hart. The poster for True Detective features Hart and Cohle in washed-out black-and-white, but Hart's hair is cut off at the top of the poster, with the rest of his hair appearing at the bottom of the poster.

The article notes that if the poster were in color, it would feature Hart's blond hair, which would correlate with the Yellow King having a "yellow crown." Yahoo followed up the article by speaking to Michelle Monaghan (who plays Maggie) about the theory, but the actress was tight-lipped.

True Detective airs Sundays at 9 p.m. on HBO.

Watch the promo for the next episode of True Detective here: