Robert Durst, the main subject in HBO's The Jinx: The Life and Deaths of Robert Durst, gave quite a reason for why he chopped up his neighbor's body in the most recent episode.

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Durst has been the prime suspect in two murders over the years, in addition to potentially being behind his wife's disappearance. In episode 4 of The Jinx, documentary footage showed Durst revealing why he dismembered his neighbor Morris Black out of self-defense.

"Black was shot in the face with my gun in my apartment," Durst proclaimed on the stand. He chose not to call the police because he was afraid they would connect him to everything in his past. "I just didn't think I would be believed."

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Speaking as a free man today, he said, "I was scared to death. I had to get this corpse out of my apartment."

He said that while he had originally planned to drag the body out in a sleeping bag, it proved to be too "ridiculous," adding, "Morris had tools. Saws, a giant ax. I don't think he had a bow saw. Anyway, I went and bought a bow saw and a bunch of garbage bags. I'm sure I got more stoned and more drunk and dismembered the corpse, some with the axe but primarily with the bow saw and I think with another saw Morris Black had."

Durst was coached to say that he did not remember many of the events of that day, and the jury ultimately found him not guilty of murdering Black.

The most intriguing moment of the episode occurred when Durst (in the present) was told that they should take a break by the documentary's filmmaker Andrew Jarecki. However, Durst sat in his chair and began muttering some practiced phrases to himself.

"I did not knowingly, purposefully lie," he whispered to himself, saying it again and adding the word "intentionally" to the phrase. "I did make mistakes," he added.

Durst's lawyers then came over to tell him that his mic was still on and that they were able to hear everything, but he did not seem to care at all.

"I did not tell the whole truth," Durst told one of his lawyers. "Nobody tells the whole truth."

It will be interesting to see where this goes and if Jarecki will acknowledge these offhanded comments in the final two episodes set to air.

The Jinx: The Life and Deaths of Robert Durst airs Sundays at 8 p.m. ET/PT on HBO.

Watch the promo for the next episode of The Jinx below: