CNN  — 

It was a heartbreakingly happy Facebook post.

Early Saturday evening, British pilot Eric Swaffer posted a picture of his smiling girlfriend and regular co-pilot, Polish-born Izabela Lechowicz at a VIP entrance to the King Power stadium, in Leicester, England.

A few hours later Swaffer and Lechowicz died with three others, including Leicester City club owner Vichai Srivaddhanaprabha, when the helicopter Swaffer was piloting plunged to the ground outside the stadium.

Investigators are yet to establish the cause of the accident which sent the helicopter spiraling 200 feet to the ground just after it flew over the top of th