The Malibu "JetProp" took-off from runway 23 for a flight to Zwartberg, Belgium. The pilot contacted departure and was cleared to climb to FL90 and soon after was vectored to a heading of 170. The departure ATC noticed it was descending and provided immediate assistance with vectors. GVA ATC was expecting the Malibu to eventually fly back to Geneva (several holding instructions to at least one departing and two approaching aircraft were issued) but as the video shows it turned-out to be another tragedy.