I don’t know about the poem, because I did not connect Murders to st. Valentine and thought the connection was random, snow day.
But today, reading about that mysterious saint, I have found out:
- that St. Valentine’s holiday is the other form of pagan Lupercalia. So if, for example, the person reads into the history, and a goat hide, cut into strings, especially with blood on it, was found in the CS, this to me would indicate what kind of books the killer would be interested in, and in general, the area of his knowledge. (So maybe the “random” issues on the CS are not so random, I want to say, but one has to know the connection?)
- that possibly, the first “Valentine” was written by St. Valentine himself
But the first known Valentine was written by Charles, Duc D’Orleans, in Tower.
Here it is:
“My very gentle Valentine,
Since for me you were born too soon,
And I for you was born too late.
God forgives him who has estranged
Me from you for the whole year.
I am already sick of love,
My very gentle Valentine.”
So if we knew that a letter was found, and its contents, perhaps we could find the origin.
I suspect that if the dude writes poems, he probably plagiarizes. The poems of Charles of Orleans (a lot) are on Goodreads, maybe look for something there?