Here are three things to know:
1. Mr. Diehl became president and CEO of the hospital in 2016.
2. The reason for his departure is unclear.
3. San Francisco-based Dignity Health recently entered into a management agreement with the Mark Twain Health Care District to oversee the hospital under a 30-year lease.
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Cedars-Sinai Medical Center taps UMass Memorial exec as COO: 4 takeaways
