When Williams grew up in the 700 block of South 63d Street, the neighborhood was less violent. The corridor he patrolled Saturday spans the 18th and 19th Police Districts, which in the last year had 36 murders, 108 rapes, and 1,150 aggravated assaults.
Williams remembers the time his mother and his aunt began carrying big sticks on walks in the park. They were afraid children would rob them.
"It was one of the reasons I went into law school and wanted to be a prosecutor," he said. "I wanted to be on the side of victims of crime."