[kragen]

It's a good bet that, when a young person in a highly-developed country dies and the announcements about them do not give a cause of death, they killed themselves. Given that he was white and had announced an intention to kill himself the night before, it's almost an open-and-shut case.

[mrschwabe]

This seems to have unfolded rapidly and the details are very light so I would like to suggest that no, this is not 'almost' an open and shut case.

[chr15p]

Its a possibility certainly but its also possible that the cause of death is not yet know, and wont be until an autopsy is carried.

Given other people are talking about other erratic behaviour over the last few days then an aggressive brain tumour or bleeding into the brain would also be possibilities. Best not to jump to conclusions too early (the same is also true for those suggesting police brutality as the cause)