According to this article: The Vanishing At The Cecil Hotel Ending Reveals What Happened To Elisa Lam - & Another Insidious Twist The victim had a history of bipolar disorder mental problem. Autopsy showed no sign of assault but under medication - The medications were found in her bloodstream, but their levels were “interestingly” low. The article also explained why she was naked. In other words, her death was most likely due to her bipolar disorder.