Cpl. Nathan Cirillo is pictured in this handout photo taken from a group photo of the Canadian Army Contingent on Oct. 19.

People sign a Canadian flag at a makeshift memorial to Cpl. Nathan Cirillo outside of The Lieutenant-Colonel John Weir Foote Armoury in Hamilton, Ontario, on Thursday.

Josh Thomas, 20, signs a Canadian flag at a growing memorial to Cpl. Nathan Cirillo outside The Lieutenant-Colonel John Weir Foote Armoury in Hamilton, Ontario, on Thursday.

People pay their respects to Cpl. Nathan Cirillo, 24, at the National War Memorial in Ottawa, near Parliament Hill, on Thursday.

Ottawa Police officers move flowers to an area in front of the National War Memorial near Parliament Hill , where Cpl. Nathan Cirillo, 24, was killed by a gunman in Ottawa on Thursday,

A woman leaves after paying her respects to Cpl. Nathan Cirillo, 24, at the National War Memorial in Ottawa, near Parliament Hill on Thursday. Michael Zehaf-Bibeau fatally shot Cirillo on Wednesday at the memorial before setting his sights on Parliament Hill.

Canadian Prime Minister Stephen Harper is applauded as he rises to make a statement in the House of Commons on Thursday in Ottawa.

A man pays his respects to Cpl. Nathan Cirillo, 24, at the National War Memorial in Ottawa, near Parliament Hill on Thursday.

New Democratic Party leader Tom Mulcair speaks with the House of Commons Sergeant-at-Arms Kevin Vickers after making a statement in the House of Commons on Thursday. Vickers was hailed as the man who stopped a gunman in Parliament on Wednesday.

Ottawa police officers comb the area in front of the National War Memorial near Parliament Hill in Ottawa for evidence on Thursday, a day after Cpl. Nathan Cirillo was shot dead there.

House of Commons Sergeant-at-Arms Kevin Vickers carries the mace during the Speakers Parade on Parliament Hill in Ottawa on Thursday. Applause greeted Vickers as he entered the legislative chamber. Vickers was among those who opened fire on Michael Zehaf Bibeau, who stormed Parliament Hill on Wednesday.