The body of a Palestinian refugee was found on Sunday at a bus stop in the southern Lebanese city of Sidon.
The unidentified Palestinian refugee, born in 1964, was found lying on the ground, while being out of breath.
Lebanese security forces opened an immediate investigation to identify the cause of death.
The body underwent a PCR test while a forensic pathologist examined the corpse to determine the cause of death.
The post mortem found out that the refugee died of a heart attack.