The Lady Who's Known as Lou

About as much as a body can ever learn about Lou is out of Robert Service's poem of the Klondike Gold Rush ----- The Shooting of Dan McGrew:

A bunch of the boys were whooping it up in the Malamute saloon;
The kid that handles the music-box was hitting a rag-time tune;
Back of the bar, in a solo game, sat Dangerous Dan McGrew,
And watching his luck was his light-o'-love, the lady thats known as Lou.
When out of the night, which was fifty below, and into the din and glare,
There stumbled a miner fresh from the creeks, dog-dirty, and loaded for bear.
He looked like a man with a foot in the grave and scarcely the strength of a louse,
Yet he tilted a poke of dust on the bar, and he called for drinks for the house.
There was none could place the strangers face, though we searched ourselves for a clue;
But we drank his health, and the last to drink was Dangerous Dan McGrew.
Theres men that somehow just grip your eyes, and hold them hard like a spell;
And such was he, and he looked to me like a man who had lived in hell;
With a face most hair, and the dreary stare of a dog whose day is done,
As he watered the green stuff in his glass, and the drops fell one by one.
Then I got to figgering who he was, and wondering what he'd do,
And I turned my head  and there watching him was the lady thats known as Lou.
His eyes went rubbering round the room, and he seemed in a kind of daze,
Till at last that old piano fell in the way of his wandering gaze.
The rag-time kid was having a drink; there was no one else on the stool,
So the stranger stumbles across the room, and flops down there like a fool.
In a buckskin shirt that was glazed with dirt he sat, and I saw him sway,
Then he clutched the keys with his talon hands  my God! but that man could play.
Were you ever out in the Great Alone, when the moon was awful clear,
And the icy mountains hemmed you in with a silence you most could hear;
With only the howl of a timber wolf, and you camped there in the cold,
A helf-dead thing in a stark, dead world, clean mad for the muck called gold;
While high overhead, green, yellow, and red, the North Lights swept in bars? 
Then you've a hunch what the music meant . . . hunger and might and the stars.
And hunger not of the belly kind, thats banished with bacon and beans,
But the gnawing hunger of lonely men for a home and all that it means;
For a fireside far from the cares that are, four walls and a roof above;
But oh! so cramful of cosy joy, and crowded with a womans love 
A woman dearer than all the world, and true as Heaven is true 
(God! how ghastly she looks through her rouge,  the lady thats known as Lou.)
Then on a sudden the music changed, so soft that you scarce could hear;
But you felt that your life had been looted clean of all that it once held dear;
That someone had stolen the woman you loved; that her love was a devils lie;
That your guts were gone, and the best for you was to crawl away and die.
'Twas the crowning cry of a hearts despair, and it thrilled you through and through 
"I guess I'll make it a spread misere," said Dangerous Dan McGrew.
The music almost dies away . . . then it burst like a pent-up flood;
And it seemed to say, "Repay, repay," and my eyes were blind with blood.
The thought came back of an ancient wrong, and it stung like a frozen lash,
And the lust awoke to kill, to kill . . . then the music stopped with a crash,
And the stranger turned, and his eyes they burned in a most peculiar way;
In a buckskin shirt that was glazed with dirt he sat, and I saw him sway;
Then his lips went in in a kind of grin, and he spoke, and his voice was calm,
And "Boys," says he, "you don't know me, and none of you care a damn;
But I want to state, and my words are straight, and I'll bet my poke they're true,
That one of you is a hound of hell . . . and that one is Dan McGrew."
Then I ducked my head and the lights went out, and two guns blazed in the dark;
And a woman screamed, and the lights went up, and two men lay stiff and stark.
Pitched on his head, and pumped full of lead, was Dangerous Dan McGrew,
While the man from the creeks lay clutched to the breast of the lady thats known as Lou.
These are the simple facts of the case, and I guess I ought to know.
They say that the stranger was crazed with "hooch," and I'm not denying its so.
I'm not so wise as the lawyer guys, but strictly between us two 
The woman that kissed him  and pinched his poke  was the lady known as Lou.

If you like Service's poetry have a look at the Collected Poems of Robert Service