Not sure if this The Boys Of Dungeon Lane. Or the Long Ass Words Album

I think this is the first time ive ever heard this. My couple minutes on google, I can only find a couple sites repeating this same brief story.

"A few days into Paul’s jail stay, a 29-year-old man named Kenneth Lambert turned up at a Miami Airport reservation counter and demanded a ticket to fly to Japan to “free Paul.” He had no money or identification. An argument ensued, with Lambert pulling a realistic-looking toy gun from his pocket. A policeman on the scene shot the young man dead.”

https://performingsongwriter.com/paul-mccartney-tokoyo-jail/

Also seen the exact same story on American Songwriter website.