Clue 8136631

Every room holds the picture of revolvers staring at her/
A final wrench in the heart/
But she knows all the ropes/
The night of a murder/
The knives are out/
Axe the dim candlestick to the blackout
She swallows all the slippery slopes/
Wear her silent dagger/
For the night of a murder/

Look at me, sing in the key, and you'll know who killed me.