CHICAGO — WGN Investigates has obtained surveillance video of the shoot-out that left a retired Chicago firefighter dead.Police are now using it to try catch those responsible.It was a routine afternoon trip to a favorite popcorn shop for Dwain Williams, but ended in his murder. The 65-year-old was in the 2400 block of West 118th Street around 2 p.m. Thursday Dec. 3 when, according to police, he was the target of an attempted carjacking.WGN Investigates has obtained private security camera footage that shows just how fast the attempted carjacking and shoot-out happened.The...…CHICAGO — WGN Investigates has obtained surveillance video of the shoot-out that left a retired Chicago firefighter dead.Police are now using it to try catch those responsible.It was a routine afternoon trip to a favorite popcorn shop for Dwain Williams, but ended in his murder. The 65-year-old was in the 2400 block of West 118th Street around 2 p.m. Thursday Dec. 3 when, according to police, he was the target of an attempted carjacking.WGN Investigates has obtained private security camera footage that shows just how fast the attempted carjacking and shoot-out happened.The...WW…