The health emergency occurred just weeks after Jimmy's nephew, Troy Osmond, suddenly passed away in his parents' Georgia home, RadarOnline.com reported.
Jimmy, 55, reportedly suffered the stroke after his performance as Captain Hook in Peter Pan at the Birmingham Hippodrome on Thursday, December 27.
The theatre has confirmed the actor will be replaced by Darren Day this week.
A spokesperson for Jimmy Osmond confirmed the news, stating that Marie's brother was "driven straight to the hospital and diagnosed with a stroke."
This is not the first stroke the actor has suffered. In 2009, Jimmy recalled having a stroke at the age of 40, which blindsided him. The father of four learned then that he had been living with a hole in his heart since birth.
The scary holiday encounter was sure to come as a shock to the Osmonds.
RadarOnline.com reported earlier this year that the famous siblings barely speak. Jimmy, the beloved baby of the family, revealed that the family doesn't get together anymore "like we used to."
On November 9, Jimmy's nephew, Troy, was found dead in his mother Mary Osmond's Georgia home.
Troy, who encountered substance abuse issues throughout his life, was discovered motionless in his bed.
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