The accident was reported to police around 2:18 p.m. at the intersection of Nutwood Avenue and Ladera Vista Drive. The victim, believed to be in her early 20s, was pronounced dead at the scene by paramedics.
Police say according to witnesses, the girl was travelling eastbound on Nutwood Avenue approaching Ladera Vista Drive, as the delivery truck prepared to turn left onto Nutwood from northbound Ladera Vista Drive.
Police say the driver of the FedEx truck did remain on scene and was cooperative. The intersection was closed for an investigation.
The cyclist has not been identified, pending notification of kin.
The cause of the accident remains under investigation. Anyone who may have witnessed the accident is urged to call Fullerton police at (714) 738-6813.