Security camera footage can reveal crucial parts of a murky story to investigators, but sometimes what the cameras capture is more than a little frightening – especially when the story has a gruesome end.

21-year-old student Elisa Lam checked into the Cecil Hotel in Los Angeles (a place with a very creepy history), and then disappeared. One week later, her body was found floating in the water tank on the hotel roof. 

What police saw when they reviewed the hotel security footage was deeply unsettling…

Lam had been diagnosed as bipolar disorder, and police determined that in this footage, she was having a manic episode. They suspect that in the midst of her episode she somehow got access to the hotel roof, where she tragically took her own life.

Share this unsettling footage with your friends below!