Detectives had been looking for 21-year-old Diallo Dwyan Daniels since naming him a suspect in the shooting of 27-year-old Juan Romero Reyes.
It happened around 1:30 a.m. August 1.
A relative told ABC11 that Reyes leaves behind a wife, 3-year-old son, and 6-month-old daughter.
Daniels is charged with murder, aggravated assault, and violating his probation.