Marcus Marshall was 19 when he was shot dead inside a liquor store in the 5700 block of South State Street in Chicago just after midnight on September 1, 2010. He was inside the store around 12:40 a.m. with two others, including 21-year-old Shawntell Harris; both Marcus and Shawntell Harris were fatally shot while the third person escaped uninjured.

Surveillance cameras inside the store captured the attack. Investigators used that footage to identify the shooter as Samuel Gayden, who was arrested and charged in the killings. During his custody he attempted to arrange the murder of a witness who was to testify against him. Prosecutors relied on the surveillance video and witness testimony at trial. Gayden was convicted for the murders and for the plot to eliminate a witness and received life plus 20 years.

Did anyone who knew Marcus or saw him that night come forward with additional details that helped the case?