I just want to address the last sentence above. I don't think it proves much to say bipolar people don't usually do the exact, specific acts of this one individual. It doesn't tell us much one way or the other that bipolar people don't normally crawl into water tanks on the roofs of buildings, because it isn't those specific events that are causing people to conclude that her mental illness diagnosis played the primary role in her death.The case is closed, but still unsolved. Mental health professionals that posted here <modsnip> "guessed" that she was having mental issues during the video. This was guesswork and having some background in psychology I can tell you that people with bi-polar disorder do not normally walk to the roof of a building and accidently kill themselves in a water tank.
I feel like the important point in analyzing the mental illness aspect of case is this: people suffering from bipolar psychosis (and even severe states of mania or depression) absolutely do engage in bizarre and sometimes dangerous behaviors of all kinds, and the findings put forth by the coroner fit well within that range. Whether or not EL's bipolar diagnosis did indeed cause her to do this, it is definitely well within the range of possibility. Bipolar psychosis cannot be discounted as a perfectly viable explanation, just as foul play cannot be discounted
And while the video can be interpreted in any number of ways, it does fit very specifically into the behavioral patterns associated with psychosis, despite the fact that it does not provide enough information to say for sure what is happening. I think that statistically it is much more likely that her elevator behavior is explained by mental illness than than a stalker or killer chasing her or playing games with her (not that those are the only two possibilities).