A 25-year-old Vietnamese woman is believed to have fallen from West Coast Highway, which is a viaduct running above Telok Blangah Road.
The Straits Times understands that the woman and the man were travelling on a motorcycle on West Coast Highway just before the woman fell to her death. She landed in front of a bus stop near Seah Im Food Centre.
Police received a call requesting for assistance at about 3.20pm. Singapore Civil Defence Force (SCDF) was informed at the same time and despatched an ambulance to the scene.
When police arrived, the woman was found lying motionless and pronounced dead by paramedics at the scene. A man in his 20s who was at the scene refused to be conveyed to hospital, said an SCDF spokesman.
The police are investigating the unnatural death.