Chicago has been having a very bad summer. Between the first day of June and the last day of August, 152 people were killed. Of those 152 murders, 38 were teenagers. With bloodshed in the city's neighborhoods gaining national attention, the city's hard-edged drill scene—which has produced rising rap stars like Chief KeefLil Reese, and King L—has reflected this climate of violence. And the killing continues.

Last night, Joseph Coleman, an 18-year-old rapper known as JoJo, was gunned down on the city's South Side while riding a bike. JoJo was found unresponsive around 9 p.m. with a gunshot wound and later pronounced dead at the University of Chicago Medical Center. His murder remains unsolved but speculation on Twitter has been running rampant.

Back in April, the rapper released a diss song aimed at Chief Keef and Lil Durk. In the video, JoJo and his friends show off an extensive collection of guns. Yesterday, JoJo uploaded a video of himself and a friend driving by Lil Reese and taunting him. After JoJo was found dead last night, Keef and Reese took to Twitter, as did an associate of JoJo's.

Complex looked into the incident and put together this timeline of what's happened during the last 24 hours in Chicago.