The man, whose name was not released, hit the woman on Saturday, July 20, just after 3:30 p.m. as she walked her bicycle across Concord Street, the Middlesex District Attorney said.
Paramedics rushed the woman to Lahey Hospital, where she was later pronounced dead, the prosecutor's office said. Her name has not been released as authorities contact her family.
The driver remained at the scene.
An initial investigation revealed he was likely using his phone when hit her with his Volkswagen GTI, the prosecutor said. His license was also suspended.
He was cited and ordered to appear in Concord District Court at a later date.
Click here to follow Daily Voice Medfield and receive free news updates.