A minibus had to brake sharply while it was travelling along the Antrim Road in north Belfast on Thursday at around noon.
The PSNI says a passenger in the minibus was injured and has since died.
Police are appealing for witnesses following the incident which happened near the Co-Op.
Inspector Murphy is appealing for the driver of a car which was in front of the minibus and a pedestrian who was crossing the road to get in touch.
“I would appeal to the driver of a car, which was in front of this minibus and a pedestrian who was crossing the road to contact police at Tennent Street PSNI Station on the non-emergency number 101, quoting reference 1344 25/09/19, as they may have information that could assist police with their investigation.
“I am also keen to speak with motorists who may have been driving in the area and have dash cam footage fitted to their vehicles that may have captured this incident,” added Inspector Murphy.