According to WGN Channel 9 news, good Samaritan was shot and killed after chasing down the driver who hit a biker and fled the scene.
The incident happened around 1:30 a.m. at 76th and Champlain in the city's Chatham neighborhood.
Police said the man was in a car recording a group of bike riders, when a 30-year-old female rider was struck by a vehicle. The driver fled the scene.
The man chased down the offender's vehicle and confronted the driver. The two got into a verbal altercation, when another vehicle approached and someone inside fired shots, striking the man twice in the neck.