On public Finnish FB page "Thailand friends" there is a mention from one writer that he sold his property in Finland and moved to Thailand. Bought 4 million house, car, motorcycles, Sauna and so on. This wife attacked friend of his once. He says that his life situation was in order but the close circle (meaning family) here in Thailand was not.
I think it's easy to say - for the wife - that the guy had suicidal thoughts etc. at home in Finland as she well knows that Thai police will not check it and wants to close to case quickly. There's nothing in for them (maybe).
I'll update if I see or hear anything else.
+ after seeing the photos of him he is quite a big guy and I think he must have been drugged before slitting his throat or he was sleeping (if that's the case, but I personally do not believe in suicide). Hopefully they do an autopsy and there are some people in contact with police with background info.