I haven't personally experienced anyone near me committing suicide for no apparent reason but, yeah, I know of people ending their own life without anyone really ever understanding it.
The thing of it is, having been suicidal myself more than once in life and in fact being mildly suicidal as we speak, it is a very complicated topic.
So many factors can contribute to people feeling like suicide is the only out:
- Economical challenges (extreme debt, extended unemployment, etc.).
- Health issues (consider, for example, a diagnosis of a terminal illness).
- Romantic troubles (unrequited love, infidelity, etc).
- Broken heart for non-romantic reasons (death of a loved one, for example).
- And more...
Really, to ever fully understand it, you would have to know the person really very well or they would have to have left a note that offers the explanation.
In fact, speaking for myself for a moment... I woulldn't say I am actually all that depressed. It's just that my life isn't going anywhere and it hasn't for quite some time now. I'm completely stuck with no way out. Not going to be able to rely on anyone aiding me financially and helping myself financially isn't going anywhere either. I am in the extended period of unemployment group of my previously listed examples.
Yeah yeah, I know... hunt for jobs harder. It's not that simple, folks. I'll see your 'hunt harder' and raise you literally thousands of attempts. Come at me again sometime. Really. It's not that simple.
Which really is what it amounts to in case of suicide. It never is as simple as you might imagine it being.
And no, not actually going to end my life. Never did and I was suicidal as early as 8 years of age. Do not ask, it's very complicated. Still around over 30 years later, so, I'll muddle through somehow this time around as well.
TL;DR -- Speaking from experience -- No, it's not always an obvious depression. It's... complicated and requires a complete picture to fully understand, if at all possible.