Paul Vukadinovic, 30, pleaded guilty to charges in the shooting death of Alprentiss Nash back in July. Vukadinovic shot 40-year-old Nash in the chest at 2:20 p.m. July 28 in the 400 block of South Paulina, authorities said.
Police said Nash was shot in the chest as tried to rob Vukadinovic and the two had a long drug history.
Nash was exonerated of a murder charge in 2012. After serving 17 years in prison, DNA evidence cleared him of that crime. He'd been convicted of the murder and robbery of a Chicago man on the South Side in 1995.
Vukadinovic was also convicted of a separate drug charge and sentenced to one year in prison, which will be served consecutively to the sentence for the weapon charge. He will receive credit for 133 days served in the Cook County jail.
The Sun-Times Media Wire contributed to this report.