Authorities said Wolk purchased the two handguns used in the shootout in the 1970s through a federally licensed firearms dealer. Wolk legally renewed his registration every two years and was allowed to keep the guns in his home in the 2400 block of North Avers Avenue because he purchased them before 1983, when the city banned the registration of handguns for Chicago residents. Federal authorities continued to trace a third handgun found in Wolk's home.

Officers and Wolk exchanged gunfire for 10 minutes before Wolk, who was holed up in his kitchen, was killed. The officers fired 24 rounds at Wolk while he returned fire 10 times, police said.

Marquez was not wearing a protective vest as required, but Police Supt. Terry Hillard said a vest would not have saved his life because he was also shot in the head.

Hillard said after the investigation is complete, he will reassess police procedures to see if changes may be necessary.

Asked whether officers should have been breaking down a door and whether there should have been additional backup, Hillard replied, "Let us bury our police officer first and complete the review."

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