US TV
Rex Features
According to Entertainment Weekly, the star's exit is a creative decision on the part of the show's producers.
The actress, who plays Dr Allison Cameron on the series, is the first of the original castmembers to depart. She is believed to have filmed her last scenes earlier this week.
Morrison's final episode is expected to air in November.
Suspicions about her future in the show were raised last week when she failed to attend a premiere screening in Hollywood.
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