One year ago, as families, friends, neighbors and revelers celebrated Independence Day in a relatively quiet suburb of Chicago, shots were fired from above. Within seconds, the scene in Highland Park devolved into something grisly and primal, as parents scrambled for kids and paradegoers ducked for cover.

       The Highland Park Fourth of July parade shooting marked the deadliest mass shooting in Illinois in the last decade. Seven people were killed and dozens more injured after a gunman opened fire from a rooftop high above the parade’s main thoroughfare.

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       [ Highland Park, a year later: Coverage of the one-year anniversary of the shooting ]