Rotorblast - why are you running this vendetta? It looks like you did not like Mr Oortmarssen, and, if what you say is true, you or some colleague of yours tried to get him exposed to the FAA, but he is dead now so he should not concern you anymore.
Henny39 - do you know if your brother had intended to fly to (e.g.filed a flight plan) to LOAV (Bad Voslau) or LOWW (Vienna)? The problem I have with a medical (pilot incapacitation) explanation is that the reports state that he cancelled IFR (which is normal) but no urgency call has been reported, yet LOAV was not accessible given the weather conditions obtained for either airport, but Vienna would have offered an easy and stress-free ILS approach which, if the pilot was for example not feeling too well, he would have taken. Also, most modern planes can fly an ILS using the autopilot which makes this the obvious choice if there is any problem or a high workload. He was obviously not short of money to the extent of ruling out Vienna on the basis of the landing fee, which many pilots would have done.