The Evidence
"This is my 여우구슬," you explain as you show the marble which contains the confession. "Where I came from, these devices could be used to gain intel from the brains of others. I believe what you'll find here is the proof that I am not the killer."
You open the device to show a holographic screen that shows the inner workings of what you've found in Coyote's brain, including a detailed visual account of his infiltration to the site on Earth where he killed innocent humans and took their hearts to make it look like it was you.
"I suppose this does check out. I apologize for accusing you without proper evidence. You're free to go." he says.
"And what of Coyote?" you ask.
"I will take care of it."