The suspect was described as an Asian male between 18 and 22 years old, 5 feet 9 inches to 5 feet 11 inches tall and weighing 150 pounds. He was said to have dark eyes and dark hair that's short and spiked.
Officials said a 55-year-old female driver apparently did not see the suspect crossing the road.
She rolled down the window to speak to him, but he reached in and stabbed her several times in the hand. He then got into a car with a female driver and left.
Anyone with information related to the incident was urged to call the South Pasadena Police Department at (626) 403-7265.