What causes the white strip to turn pink after dying? See pic

caseyjones

In Memoriam
I'm not 100% sure but I don't believe this pink was there when it was alive. If it was, it was very faint. This fish was imported about 6 days before it died. I suspect some sort of poison, possibly cyanide. Can anyone confirm this will actually science?
scsbrp1.jpg
 
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