Beverley told the story during a recent episode of The Pat Bev Podcast ... sharing the wild story with his co-host, Rone, and guest Dave Portnoy.

PB says it all went down during the first round of the Western Conference Playoffs ... when the Rockets played the Thunder.

During the 2nd quarter of game 2, Westbrook, who was taking the ball up the court, was about to signal for a timeout when Bev, guarding Russ, lunged in an attempt to steal the ball, inadvertently contacting Russ' knee.

Westbrook suffered a torn meniscus, ending his season, and turning Beverley into public enemy #1 in the eyes of many OKC fans, including the ball boy, who presumably blamed Pat for the injury.

"I had a ball boy threaten to kill me over the Russell Westbrook injury," Pat said. "I get to OKC the next game, the police officers in front."

"They put a police car in front of my house in Houston. I get to the hotel, I'm on the floor by myself. They passing out papers of a young guy's face ... he threatened to kill me."

Pat says his head coach at the time, Kevin McHale, warned him Westbrook's injury had become a hot topic ... and the attempted steal was at the center of the controversy.

But, despite at least one threat to his life, Beverley says he was never phased and was actually upset he didn't come face-to-face with the ball boy.