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.

The family of 34-year-old Nick Burkett started a memorial of candles, flowers and pictures near 16th Street and Wazee Street in downtown Denver on Friday, just days after his death. He and 71-year-old Celinda Levno were killed in two of the four random stabbings along the 16th Street Mall last weekend.

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.