Deandre Y. Harris has been charged with first-degree murder and aggravated battery with a firearm in connection to the shooting.
Police said Harris is dating a 19-year-old woman, who lives at an apartment in the 500-block of Deepwoods Drive.
Harris was visiting his girlfriend when he got into an argument with a 48-year-old man who lives in the apartment, just before 11:40 a.m. Tuesday.
Police said Harris shot the man and the man's girlfriend, a 47-year-old woman.
Police found a gun in Harris' vehicle Tuesday, officials said.
Harris is due in court Wednesday morning.
The state's attorney's office intends to file a petition to detain Harris, pending trial.