Dolly Parton is feared to be "driving herself to the brink of death" with a "brutal" work ethic, sources are warning RadarOnline.com .

Despite mounting health fears for the 79-year-old and the toll of her ongoing grief over the recent death of her husband Carl Dean , she is keeping up a relentless pace from her sickbed for the sake of her fans. Article continues below advertisement

Relentless Pace from the Sickbed Tap Here To Add Radar Online as A Trusted Source Article continues below advertisement Article continues below advertisement

The country legend was forced into cancelling concerts this year – including a planned Las Vegas residency – after a series of medical setbacks left her recovering at home in Brentwood, Tennessee, where she had lived with her long-term l

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