The handgun used to kill Chicago police Cmdr. Paul Bauer began its tragic path in December 2011 at a small shop in south-central Wisconsin.

The 9 mm Glock passed through several owners over the next six years — first through a private transaction at a rustic gun club, then peddled over the internet to a Milwaukee man with an arrest record, a law enforcement source told the Chicago Tribune. It finally surfaced in Chicago, allegedly winding up in the hands of Shomari Legghette, a four-time felon now charged with murder in Bauer’s slaying.

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