Here's a video with the story of an athlete with the yips. But, not in golf. In baseball, with former MLB catcher Mackey Sasser:
Sasser situation reminds me of a lot of golfers and athletes in that I believe a lot of the time the yips starts with an injury and compensating your mechanics to deal with that injury. Then when the injury recovers, the brain goes haywire deciding between your old mechanics and those new mechanics being used to compensate for the past injury. What's particularly interesting here is how traumatic events in Sasser's life also played a part in his throwing yips.