Police were called to the scene on State Road (Route 1) near Meetinghouse Lane in Springfield Township around 8:43 a.m. Wednesday.
Fifty-four-year-old King Hua, a township resident, and his wife were traveling in a white Toyota southbound on State Road when the female driver of a vehicle passed them on the shoulder.
Shooting investigation in Springfield Twp., Delaware County
The vehicle then stopped and a male passenger partially got out and fired shots at the victim's Toyota.
The bullets went through the windshield and hit Hua. He was taken to the hospital but died from his injuries.
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Investigators believe the victim was shot and killed for driving too slow.
"A man lost his life...over driving his car too slow in rush hour traffic. It's just not acceptable," said Springfield Twp. Police Chief Joe Daly.
The suspects' vehicle fled the township, police say.
A second suspect involved in this incident is still being sought at this time.