Even more clearly:
https://en.wikipedia.org/wiki/The_Jinx_(TV_series)> After the interview, Durst goes to the bathroom. Apparently unaware that his microphone is still recording, he rambles at length, ending with, "What the hell did I do? Killed them all, of course."
> On March 14, 2015, the eve of the final episode's airing, the FBI arrested Durst in New Orleans on a first-degree murder warrant the LAPD obtained in connection to Berman's death. They had undertaken an investigation based on new evidence presented in the miniseries.