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May 22, 2004^12:12am
Reedster^1
27-year old Ben Petrick Retires
sports.espn.go.com/mlb/news/story?id=1806520
Retirement
ESPN
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Sad news.  The former Rockie catcher has Parkinson's.

As the article states, it wasn't the physical toll on Petrick that resulted in the retirement.  It was the mental toll.