The victim was identified as Maya Maor, a 26-year-old au pair from Holon, Israel who was working for a Montclair family.
The incident happened at Grove Street and Mount Hebron Road in Montclair about 6 p.m. Saturday.
Authorities say the preliminary investigation indicates that Maor was struck by a DeCamp bus as she exited the vehicle. The bus did not stop.
The victim was pronounced dead at the scene.
The Essex County Prosecutor's Office and Montclair police are investigating.
Anyone with information is urged to contact the Essex County Prosecutor's tips line at 1-877-TIPS -4EC.
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