ELISA LAM

Elisa Lam, a student of 21 years from which they had gone missing for several days, was found dead in a water tank installed on the roof of the Cecil Hotel in Los Angeles.
His body was found by a maintenance worker after several reports by the guests of the Hotel about the flavor and color of the water.
The coroner ruled that the cause of the girl's death was "accidental and caused from drowning." It should be specified that during the autopsy found no trace of drugs or alcohol intake.
There is a surveillance video recorded 4 minutes from the lift that has captured the last moments of life of Elisa. In the video, the girl enters the elevator and after pressing all the buttons in vain expects that this move until seeing that the doors do not close, starts to behave strangely. In fact started looking around as if hiding from someone, then steps off the elevator and started gesturing as if he was talking about and then you walk away while the elevator back into operation.
In the time course after Elisa you must have found access to the roof and something must have happened to make her get on the water tank and drown in it.
It ignores however as she could have access to the roof despite the area was protected by an alarm and how she managed to get to get into the water tank and close the lid from the inside.
A further mystery to the fact it adds the outbreak of tuberculosis in the neighborhood near the hotel after the discovery of the body of the girl and the fact that the rescue kit used in these situations is called precisely LAM-ELISA !!
Naturally, the authorities have never been very clear with respect to each other and have established that the death of Elisa was accidental and that she suffered from bipolar (which still does not explain what happened).

        ELISA LAM AND THE TANKS 

Link of the video in the elevator:  http://www.youtube.com/watch?v=3TjVBpyTeZM