Mr Miller said he reached out and touched the man, tapping him several times, but there was no response.
"There was nothing at all."
He quickly approached the driver, who immediately called up for help and drove the short distance to the medical centre in Wellesley St.
Mr Miller stayed on the bus and said police and St John Ambulance were quick to the scene, with the man taken from the bus and placed nearby on the footpath, where he was worked on for a short time. "But he had passed away."
A screen was put up around the man's body until arrangements were made with next of kin and a funeral director.
The death had been reported at noon and police were able to open up the immediate area about an hour later.