Posted: 27/03/2015 at 21:21
I am not an experrt CT but depression doesn't usually result in psychosis. He might have been hearing a voice telling him what to do (actually a symptom of paranoid schizophrenia) but equally he might have made what was, for him, a rational decision to do what he did when the opportunity arose. Certainly the evidence is that he was not having a psychotic episode but acting in a calm and controlled way, even "breathing normally" as he plunged to his death.
There is also the possibllity that he may have been suffering as a result of medication. It isn't unknown for anti depressants to cause very negative effects in some people who take them.
Ultimately we may never know what was actually going on in his mind. And it isn't like there is going to be much, if anything left of him to do toxicology tests on.