Types of suidical ideation....
The main type of suicidal ideation is one thing and often treated quite well with medication under the auscpices of an experienced GP or Psych specialist.
Most suicidal ideation is 'inwardly' expressed.....however there is a type that relates to more than just internal suicide ideation ans becomes 'exogenous' and relates to others. This type is often related of 'Schizoactive' personaily disorders and Schizophrenia-types also.
We are all prone to a possible 'psychosis' on day based on our personality issues ans lifestyle/background.
I deal with all manner of these issues daily and have done for the last 20yrs.
We can only begin to understand what went wrong in this case. I have many times advised to 'ground'/de-roster pilots for many reasons over the years.
Pilots work in a very unusual set of circumstances compared to most. Slight hypoxia at altitude, especially on longer-haul and also sometimes very limited rest periods.