Nick Burkett’s family huddled together in the cold, passing a bouquet, candles and laminated sheet of photos between them as they created a makeshift memorial on Denver’s 16th Street Mall on Friday afternoon.

After two people were killed and two others wounded in downtown Denver, a suspect has been arrested and now faces charges related to the attacks. See a timeline and map of when and where those attacks took place.

City leaders say investments will bring people downtown, but a fatal stabbing spree adds to the challenges that remain.