Update: As of July 5, the death toll has risen to seven, with the latest victim succumbing to their injuries received during the July 4 shooting.
Robert "Bobby" E. Crimo III, 22, was taken into custody during a traffic stop on Monday evening following a multi-agency manhunt, the outlet reports.
Authorities first named Crimo a person-of-interest in the 4th of July parade massacre on Monday afternoon.
According to the Highland Park Police Department, a shooter opened fire from a rooftop on a crowd of individuals attending a 4th of July parade on Monday in Highland Park, a suburb north of Chicago.
According to a local ABC outlet, he was arrested near US Highway 41 & Wesley Road in Lake Forest after the vehicle was originally spotted at Buckley Road & 41 in North Chicago and a brief pursuit ensued.
The mass shooting killed six and injured dozens. Law enforcement has not yet confirmed the total number of victims. A high caliber rifle was recovered at the scene, according to authorities.
Authorities were looking for a 2010 silver Honda Fit, license plate DM80653, believed to be Crimo's at the time of his arrest.
This is a developing story and will be updated.