There are so many media reports, it's hard to sometimes pick fact from, well, not fact. One bit of "information", though, is pretty obviously not a fact. One solitary claim (from the Mirror, so take that with a heavy dose of salt) said that Victoria Police has cleared her of all charges, declaring it a tragic accident, but that IMO is pretty rubbish. Haven't seen any Victoria Police statements to that effect, and even so, toxicology results haven't been in (that we know of). Way too early to make that determination.
Echoing other posters, I hope Ian pulls through and can give testimony to the police about what happened before he fell violently ill. Vital info to know for investigators. So many more questions than answers at this stage. I trust VicPol has a handle on this case, and hopefully we'll see official determinations relatively soon.