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Michigan State Police are searching for a suspect involved in a fatal shooting Saturday around 3:30 a.m. on I-75 near the Rouge bridge in Detroit, Ingrid Kelley of Fox 2 reports.

A witness told police that two vehicles were southbound when the shooting occurred. A motive is unknown.

While probing the shooting, Dearborn Police contacted state troopers to let them know a gunshot victim was at Oakwood Hospital in Dearborn early Saturday. The 28-year-old Lincoln Park man later died. 

Read more: Fox 2