Twin Peaks: Who Killed Ruth Davenport? 4 Likely Suspects

We would be remiss if we didn't mention the one other (and easily the weirdest) part to this mystery: the smoky figure.

After Bill and Phyllis's conversation in prison, the camera pans over to another cell and a black figure, who looks male, vanishes into a puff of smoke. The only thing really visible had been the whites of his eyes.

A shadowy figure also comes out of the glass box in New York City and killed Sam (Ben Rosenfield) and Tracey (Madeline Zima), so maybe this is what killed Ruth and the unidentified body. This smoky figure is presumably working with Evil Cooper, since we know Evil Coop is an escapee of the Black Lodge and is most likely still possessed by BOB, plus it seems obvious that Evil Cooper is mixed up in Ruth's death, even if he didn't decapitate her himself.

Finally, this is the big reason why we think Ruth's murder is connected to the overarching plot, because there is obviously something supernatural at play here, not merely Evil Cooper and his cronies committing murder for hire (or even just murder for fun).