On October 22, 2014, during the Parliament Hill attack, Vickers was initially identified as the sole hero and credited with the fatal shooting of Michael Zehaf-Bibeau, but once the independent OPP report was released on June 1, 2015, it was revealed that the suspect was shot several times by both Vickers and RCMP Constable Curtis Barrett. Zehaf-Bibeau entered the Centre Block under the Peace Tower, shooting a Commons security guard in the leg, exchanging gunfire, before running down the Hall of Honour to an alcove by the entrance to the Library of Parliament, which is beside Vickers' office. Vickers pulled a 9mm handgun from a lock-box and entered the hall. He stood behind the pillar in an opposite position to Zehaf-Bibeau and shortly after Zehaf-Bibeau had pulled away from the pillar and shot at Barrett, Vickers threw himself on the ground and fired multiple shots at the gunman, effectively disabling him. A niece told the "Calgary Sun", "This is the first time in his career that he's shot anyone."