I believe this accident involved a standard A109 ie. not the newer 'Power' but can't be sure. It was flown by Italian crew from Helitalia who operate EMS on contract for the Greek authorities and it went down in the early evening in some of the worst storms ever seen in Greece.
I have read that there were 5 people on board including a heart attack patient and a nurse but am unsure whether it was single-pilot. Either way, the crew were reportedly having trouble with the weather conditions before the aircraft was lost on Radar.
I obviously should not be jumping to conclusions so soon, but I would not be too surprised if the horrendous conditions together with the pressure put on crews to get Medevac work done whatever the circumstances, were found to be the primary factors in this accident.
In conclusion, another tragic accident and as always, lessons to be learned by us all.