His 13 yr old Gigi was on board.
KNX witnesses said that they could hear the helicopter flying overhead but couldn’t see it because the cloud cover and fog was so heavy.
They thought it had to be flying low because it sounded so loud. They thought it was circling, looking to land. Then they heard it crash.
It is his personal helicopter, it’s likely that he was piloting.
That would seemingly be consistent with an engine problem if he was trying to land.