SPOILERS BELOW. From Recapped.com:
"Back to the first episode, about 4 minutes in, we see a naked blindfolded woman tied to a tree. The actress’ name isn’t in IMDb but the character is Dora Lange. We see Dora’s ass and most of her boobs. At 24 minutes, Michelle Monaghan provides an ass shot in panties as she is waking up. 27 minutes in we see Dora Lange again cleaned up in the morgue. And at 56 minutes, we see a photo of a different naked body hanging."
http://www.recapped.com/true-detective-nudity-review
The actress playing Dora Lange has not been identified as of yet. True Detective premieres January 12 at 9PM on HBO.