CHICAGO - Questions have emerged about evidence, accountability and leadership in an October shooting involving federal agents on Chicago’s Southwest Side.

Text messages presented in court revealed a secret Border Patrol group chat and shed light on the agent’s mindset after the shooting.

What we know:

On Wednesday, the defense cross-examined Border Patrol Agent Charles Exum, who fired at Miramar Martinez. Defense attorneys used Exum’s own text messages to question his state of mind and whether he tried to destroy evidence that could contradict his version of events.

Two key questions remain: Who authorized the release of the agents’ government-issued 2015 Chevrolet Tahoe, and who ordered repairs to the SUV before the defense could examine it?

Exum spent two hours on the witness sta

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