Dolphin Dies in Freak Accident at Illinois Zoo

September 7, 2011 Updated Sep 7, 2011 at 12:39 PM EDT

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Dolphin Dies in Freak Accident at Illinois Zoo

September 7, 2011 Updated Sep 7, 2011 at 12:39 PM EDT

A dolphin at an Illinois zoo died during a freak accident Monday after apparently colliding with another dolphin, according to a story in the Chicago Sun-Times.

There were no witnesses to the incident, but the 4-year-old dolphin's trainer heard a loud pop just before the dolphin was due to perform in an afternoon show at the Brookfield Zoo, according to the report. Preliminary autopsy results indicate a fractured skull as the cause of death.

Read the Sun-Times story HERE.