While investigators should consider all possibilities, from drunken negligence to homicide to suicide to simple negligence (reports are that he was drinking, but I have read nothing about actual toxicology findings), I would like to point out that, yes, this is the internet... but speculating about suicide could be particularly hurtful to the guy's family.
It's very unlikely that any of them will read such, here... but of all possible speculations, that is the one that would cut the deepest. I'd avoid it, personally, at least unless or until there were evidence to support it. Seems the most respectful thing to do for the family.
YMMV.