Identifying a killer: Exclusive look at how high-tech ATF lab helped solve murder of CPD officer
Mark Thompson
Mark Thompson
Reporter · Chicago, IL
Mark Thompson has spent over a decade highlighting community stories across Chicago. He graduated from Northwestern University and has contributed to various local outlets, including Chicago Reader, focusing on grassroots initiatives and neighborhood developments.
More from Mark →Reporter · Friday, November 6, 2026 at 1:11 AM · 1 min read
The ABC7 I-Team got a rare glimpse at how the Bureau of Alcohol Tobacco, Firearms and Explosives helped CPD solve the high-profile murder of Chicago Police Officer Aréanah Preston.