It was written by a trio in Winnipeg called the Wyrd Sisters. The song is entitled "This Memory"

Early that morning, cup of coffee in her hand,
Kissed her mother on the cheek, said 'I'm more busy than I planned;
I'll be coming home a bit late--could you keep the supper warm?
Oh, it's just another busy day.'

Early that morning, getting ready by the door,
Kissed her lover on the cheek, said 'I'll be coming back for more.
Oh how I love you; we've got so much to live for, baby.
Oh, and I'll be coming home real soon.'

CHORUS: But it could have been me, just as easily.
Could have been my sister, left there to bleed.
Oh it could have been my father or brother done the deed--
Oh no! Don't let me lose this memory.

Later on that evening, I turned on my TV,
Listened as they're talkin' about the news of a shooting spree.
Fourteen young women shot dead in Montreal!
Oh, it's a killing of us all.
Yes it's a killing of us all. CHORUS TWICE.