I did post it on his personal page, but in case no one knew, I am posting this in here as well.

To anyone who might read this, I got more precise details of his disappearance through his sister...And this will sound a bit like a rant, now that I am rereading this whole text.
I understand this could seem somewhat morbid, so you don't have to read this. The short answer is, his death was of natural causes...But I would have rather learned it was a stupid accident, such as being hit by a car or falling down some stairs.
Anyway, let's go with this.

passed away one year ago. On March the 12th 2014 he started feeling some pains in his left arm and went to see a doctor. He was told it was nothing and shouldn't worry too much about it. He went back home with his family (little sister and mother, from what I understood his father passed away years ago).
While they were watching TV, he stood up, did two steps and fell to the ground. He had heart attack, apparently due to thyroid problems he had been having. Her little sister tried CPR while waiting for the paramedics.
He was in coma when he arrived to the hospital and he had a second heart attack on the next day.
On Sunday March 17th, Johan, , was declared dead.
His remains are buried somewhere, probably nearby his town in Switzerland.

For one year I have been thinking it was an accident: hit by a car, falling down somewhere. I would have never imagined it was something like this: I didn't notice he was sick the few times we chatted...Though honestly, many of these illnesses lie beneath the surface, under the skin. It is not something you will know about unless you are told about it.
The moral of this story should be to take care of yourselves, and I know it can't be easy, depending on your personal health, or what kind of health care your country is offering you. It truly saddens me, and also infuriates me, that this kind of stuff is what ultimately killed him, at a rather young age, in a developed country (note: I am not implying anything like "well, if it was in deep Africa, I would understand it", since extreme worldwide inequalities tend to piss me off. Allow me to be naive and to believe that, one day, our civilization will reach a peek where worldwide affordable health care and health knowledge will exist, and equal opportunities for everybody, but I digress...).
What a waste of talent and skills, simply because his body couldn't keep up. He was older than me, it is so strange to think now that I am the older one. I promised myself to work on the comic-book we were planing on doing (he did provide me with some valuable hints, that evolved to be great parts of the plot), or at least something else, anything. I haven't done shit.
Well, maybe if I am unable to make up anything out of my life, you guys reading this can. did studies in arts, movies and script-writing, I have the feeling he was working in so many independent shorts, writing series scripts and working on pilots to try to get them approved by some TV-channel. He ultimately worked his butt off towards his art, his ideas, probably more than I ever will in my entire life.
And now he is dead.
He won't be coming back.
Any ideas he had, any other projects that were coming to fruition are now in the grave with him. As far as I'm concerned, any year above 30 is a luxury that he will never have.
So for those of us still around here, let's make something out of them.