A 51-year-old man exercising on the runway of a privately-owned airport in Lamphun was hit and killed by a small plane as it came in to land on Thursday night, police said.
Sitthidet Sae Li, died after being struck by a Cirrus 22T aircraft that had just touched down at Sahapat airport in Muang district.
A mobile phone and headphones were found near the body suggesting he had been listening to music while exercising and did not hear the aircraft approach, according to police.
The plane, piloted by businessman Ram Supha, 49, had just landed after flying from Bangkok's Don Mueang airport, police said. The aircraft sustained damage to the propeller, the right wing and the landing gear.
An investigation was underway to establish why Sitthidet was exercising on the runway while the airport was still operational.
Mr Ram, who is the brother-in-law of prominent Buri Ram figure, Newin Chidchob, often flies around the country in private aircraft.