What
If anyone wants to know who killed the green pawn, come here

Yay, I figured it out! Tina tempo did it. btw the final game was very annoying because I thought you were supposed to attack the bishop then move your pawn to f5.

I have a story for why Tina did it:
Tina was angry because Green Pawn gave her character rating 1/10 for her show, "Sacrifice Sunset".
Tina also had bad history w/ GP.
So, she began plotting.
Her first scheme was simple: Kill him. Everybody liked Tina; it wouldn't stop with the GP. Also, GP was holding protests for Tina to quit.
So, she set to work with her scheme. She had already lost 1 million dollars! She couldn't afford the second mansion she had.
And that was when she snuck into the GP pawn shop, where the GP lives.
And she slaughtered him.
Later, after hearing Madame Mate threw wine at GP, Tina took advantage and threw the detectives off by smearing wine/blood on the GP.
Until another young detective(you) comes along...
~The End~
It was a stupid accident, very anticlimatic.