Authorities say the man was seen on campus the night a shooting killed 19-year-old Jaliyah Butler.
In a separate shooting, a man was seriously injured and airlifted to hospital.
Read more: SC State campus tragedy: Homecoming joy turns into a night of fear and loss
In the investigation so far, three people have been arrested and charged in connection with the shooting.
On October 27, authorities charged 18-year-old Matthew McCoy with carrying a weapon on school property and showing and presenting a gun.
McCoy was released on $50,000 bond for the first charge and $37,000 bond for the second charge.
Another teen, 18-year-old Jimmy Lee Thompson Jr., was arrested on October 9 and posted a $10,000 bond on charges related to carrying a weapon on school property.
Read more: Second teen charged in SC state shooting released on $10,000 bond
On October 28, 18-year-old Trevion James Crawford was charged with carrying a weapon on school property.
Read more: Another person charged in SC state shooting investigation
In October, authorities said they did not believe the two shootings were linked, but that both investigations were active.
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Anyone with information can contact SLED by calling (866) 472-8477 or emailing tips@sled.sc.gov.
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