Emergency services were called to the junction of Manor Road and Barnsley Road, Cudworth at 10.50am following a report that there had been a collision between a pedestrian and a scooter.
It is believed that following the collision, the scooter rider immediately left the scene, leaving the pedestrian seriously injured.
The pedestrian, a 41-year-old man from Barnsley was taken to Northern General Hospital but later died of his injuries. His family have been informed and are being supported by specialist officers.
A police spokesman said: “We are now appealing to the rider of the scooter pictured to get in touch. We are keen to hear from anyone who may have witnessed the incident, especially anyone with dash cam footage.
“If you can help, please call 101 quoting incident number 304 of August 21.”