Just minutes before being gunned down Wednesday morning, Cpl. Nathan Cirillo stood stoically in front of the National War Memorial.
The moment was captured by a young man from Winnipeg on a tour of the monument who posted the photo to Twitter.
The caption reads: "Ok so we were on a tour at that war monument in Ottawa a few minutes ago, a few seconds later there was a shooting.."
The photo was taken at 9:41 a.m., HuffPost Canada was told by the poster. Just 12 minutes later, at 9:53 am, journalist Peter Henderson sent out what is thought to be the first tweet about the shooting.
Gunfire at the war memorial in downtown #ottawa— Peter Henderson (@Henderburn) October 22, 2014
Cpl. Cirillo, a Hamilton-based reservist with the Argyll and Sutherland Highlanders, was father to a young son.
His Instagram profile shows off his love of dogs, and particularly German shepherds.
On Sunday, Cirillo posed for another heart-wrenching photo in front of memorial.
On Sunday, we asked a very handsome guard for a picture with my friend visiting from Cali - RIP Nathan Cirillo pic.twitter.com/q80EZ6nwmo— Megan Underwood (@megunder) October 22, 2014
Cirillo and his family are in the thoughts of all Canadians today.
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