@ Snarky
A really,
really good theory, considering how little has been disclosed so far.
You seem to have experience - go on like this and we soon have a new Sherlok.
But sadly I have to place your good theory

@ Cassiebgs
I didn't forget you. Your questions will be sorted when I post the next update of the complete list.

I thought it is a scenario most of you know so it wouldn't be
that hard (also not too hard for me to do in english).

For beginners this is not the easiest way to get in touch with those riddles.
Well, I tried to help a bit with those little 'extensions' of your questions (to place them
somewhere useful instead of where they belong if taken purely) and not to forget that pic of evidence.

Since it doesn't seem to help that much so far, I want to recommend you:
First find out which kind of death you are dealing with (to get a fixed direction what to go for).
Right now you just know about one of them (the one who shot himself like Snarky stated correct).
There are some more very helpful 'yes-' and 'no-questions' already.
But right now, without knowing what they all died from, those are rather irritating.
Hope you will have a bit of fun while solving the case …
